Violin after a Joseph Rocca "Guarnerius" pattern

This is a violin I finished in October 2018.

It is made after a Joseph Rocca "Guarneri" violin made in 1854, and here's a little bit of explanation about why I chose this specific model.

The first time I used the "Alard" Rocca pattern, I was working under the guidance of master violinmaker and expert Eric Blot, in Cremona. As a freshly graduated student from the Cremona school, I had the opportunity to make a violin for Eric's workshop, since Eric was launching a "mid-price" line for his customers at that time.
Contrary to what was the common practice in town, not only was I allowed to copy his patterns and plaster casts from an original Joseph Rocca violin, but I also received help by Eric's assistant, Jan Bartos, and by Eric himself, in all the most important steps of the making. I remember Eric being very busy with the writing of his book about Piedmontese makers at that time.

After the violin was finished in white, it was Jan who varnished and set it up, because I wasn't ready to do that with the quality that Eric wanted... this doesn't mean that Eric and Jan wanted to keep it all secret, we talked about oil varnishes, lakes and rosinates quite a bit and all this information turned out to be very useful in the following years.

Eric's choice to put the apprentice's name on his workshop labels was not very common in Cremona, and it is one I appreciated very much.
More recently, I had the chance to trace the present owner of the violin via a casual encounter. I don't have any good pictures of it, unfortunately.

the violin was made after the patterns I received from Eric Blot, I just made the corners slightly longer than the original. The strong, individualistic character of  J. Rocca's scrolls has always been the most difficult part to copy for me, but I tried to reproduce all the aspects that I could remember. I have used my own oil-based varnish for this one -- a yellow ground coat made by adding aloe resin to a basic colophony/mastic varnish, and four more coats of a similar orange-amber colored varnish, containing amber (indeed) and a bit of red madder lake.

Dear Eric, if you ever read this, let me say "thank you" for all you have taught me in your workshop!  I hope that I'll be able to come by soon with another instrument, and show it to you.

Violin, personal pattern after Guarneri del Gesù

This is a violin I made on a personal pattern in the style of Guarneri del Gesù.
The body length is 352 mm. Stop is set at standard 195 mm.
The varnish is an antiqued spirit lacquer.

C Extension for Double Bass

I made this C extension for a contemporary bass by Ezio Scarpini.

For this job, I followed the detailed instructions written by William Merchant in the famous book "The Setup and Repair of the Double Bass for Optimum Sound" (Chuck Traeger, with David Brownell and William Merchant, printed by Henry Strobel, Aumsville Oregon 97325 USA, 2004 - ISBN 1-892210-06-1, pp. 360; a recommendable book for all bass repairers and builders). For some aspects of the work, I followed my taste and some constraints imposed by the particular instrument. All parts were made in my workshop. My intern student Satoko Aihara contributed in the initial steps of the making, and helped me gather many hints and examples on Japanese blogs and specialized websites.

A 4-string double bass with a C extension can be used in the orchestra in place of a 5-string bass, and for this purpose a special, longer 4th string is mounted on the instrument. In this instrument, the new upper nut is placed 27 centimeters past the old upper nut (which is cut between the 3rd and 4th) on the extended fingerboard. This will give the low C. The string runs over the nut into the throat of an aluminum 1" wheel (I used a wheel from a sailing hardware store), makes a turn, goes into a hole drilled into the scroll and reaches the A string tuning gear, while the 3rd string is mounted on the E gear. The player can use the "E stop", placed on the side of the original nut, to block the string to the original tuning. The other three keys are used to set the low string to C#, D, D#  on convenience. The player can set the most convenient stop during playing and finger the notes on the extended fingerboard by placing the thumb on its underside, which has been made smooth and concave.

The geometry of this neck and scroll dictated some choices in the making. First of all, in this instrument, the line projecting from the fingerboard base almost hits the scroll. This means that, in order to have a normal thickness for the extension at this point, and an easy to finger 4th string, I decided to make the extension out of a single piece of ebony, rather than a separate ebony fingerboard on top of a maple piece. Having a little distance from the fingerboard surface to the pegbox walls, prevented me to install a second wheel to make the 4th string reach the usual (lowest) tuning gear; I chose to follow the common method of bringing the string to the 3rd gear.

The ebony block has been fitted precisely to the pegbox walls and the scroll face, and it is secured in position with two screws. The upper face has been planed and sanded in the right shape so that it is a perfect extension of the fingerboard's shape, and the string doesn't buzz on it when playing with a bow.

For the keys, I tried to design a shape that makes them easy to move into and out of position, without making them looking too slim nor too bulky. At first, I wanted to copy the ones from a Japanese bass extension, which shape reminded me that of a duck's beak. But, it seemed to me that they may be too low for the player's fingers to unlock them easily, so I designed my own shape. They can be reminiscent of the lines of the bow frogs, since they have a curved part towards the string and a concave "cheek" on the opposite part. A small square of leather completes the key's working surface. In order to prevent excessive friction, I have put a small plastic washer between the key and the supporting plate. The brass screw is held by the threaded plate and the serrating force has been set with the aid of a "blind" nut and two drops of thread glue.

The three upper keys are supported by brass plates blocked in position by screws on the flat outer side of the extension. Since there is little wood thickness for the D# extension, I had to change the shape of this plate. This one has a "tongue" extending into a small rectangular cut that I filed into the extension, secured with three small screws, and a supporting base (without screws) that sits onto the pegbox wall and (partially) on the extension side. This prevents the thin brass tongue from bending when the key is closed.

Here are the four keys; all have a 10° skew from the perpendicular axis to the extension surface.
The "E stop" has been mounted on a brass strip, secured to the neck and running on the underside of the original nut, which has been reduced in height, as in the Chuck Traeger's method.
All the keys can be operated with the left hand, without having to hold down the string, and the height of the 4th string with all keys opened, taken at the original nut position, is about 5 mm.

This was quite a complex and demanding job for me, and perhaps the most difficult single job I had to do on a double bass. I am happy that it's working fine!

Violin peg shaper DIY

I made a "custom" violin peg shaper for my workshop some years ago. I had an "Officina Claudio Monteverde" violin in the workhop which needed a new set of pegs. I noticed that the pegholes had a non-standard conical ratio so I decided to buy a so-called "irregular" peg reamer and make my own peg shaper out of a piece of suitable wood.

 I chose a piece of a hard, slightly oily wood that I believe comes from Australia. I cut it out of a plank used for flooring.

For the cutter, I used a spare Stanley iron, which had the correct width and fastened it to the peg shaper with a threaded rod and a knurled wheel.
The metal is not as hard as regular peg shaper cutters, but it's much easier to sharpen. I use a 40° grinding angle.
A good improvement would be the placing of a reinforcement on the side opposite the edge of the iron.
I am planning to make another one with a larger diameter and regular shape, and use it to shave down the sticks that I use for bushing pegholes (Done - outer diameter 10mm)

Bow frog - simple repair

This cello bow frog by Emilio Slaviero is decorated with an oval mother-of-pearl inlay. The inlay has been worn out completely by the player's hand perspiration and needed replacing.

The old inlay was unglued with the aid of a solvent; acetone worked well.
I selected a suitable piece of new mother-of-pearl and sawed out the oval piece with a jeweler's saw, then I finished the exact shape with files.
The new inlay was glued in with cyanoacrilate and filed down following the concave shape of the frog. Finally, the area was finished with a felt wheel and a fine rubbing compound made by the Menzerna firm.

Square for blocks and ribs

Having a support for a carpenter's square is handy when it's time to check the squareness of the cuts in corner blocks.
I made this jig for my Stanley square out of some pieces of a blue HDF board (high-density particle wood).
Board thickness is 12.5 mm (1/2"). This material is easy to cut and file and it's perfectly flat.
The square just slides in and it can be placed on the mould surface just over the blocks.

Viola, 16" personal pattern

I made this instrument in 2010.
The back is made out of a piece of "Oppio" maple, the top plate is from a spruce tree that I have found near my birthplace, in Valle d'Aosta. It has a very pronounced "bear-claw" figure and it's density is about 0.46, so it's heavier than usual.
Varnish is a personal recipe similar to the famous Marciana oil varnish, but I made it with walnut oil instead of linseed.

Gennaro Gagliano 1748 cello

This is an instrument I made in 2012.
The pattern is from a cello that was made by Gennaro Gagliano in Naples, dated 1748.
The original instrument is owned by Dextra Musica Foundation in Norway.