
The male tamboura gourd seen below is badly smashed. It is worth repairing because it is a Hemen 6 string concert model, and sells for around $1750.00. This repair will cost around $1,250.00 in labor (17 - 20 Hours @ $75.00 an hour) To the owner of this Tamboura it is worth it. In a lesser instrument, it would be cheaper to buy another. Some of the gourd is pulverized and will be discarded, other sections are missing altogether. We save what we can of the old gourd, and the rest will be made up from our gourd parts stash.
I respectfully offer this warning. There is a lot of very helpful and accurate information on the internet, and there are well-meaning novices who share their personal experiences doing music repairs. Unfortunately the good information sometimes gets buried by the sheer quantity of confusing information. Some of these folks claim to have been trained by me, I have only 2 trainee apprentices. My sons Amber, and Kalyan. They have completed 20 years of training in world music repair, and "The Perfect Third" music training.
Some of this web advice include instructions about patching gourds with fiberglass, Bondo, carbon fiber, and other high-mass 2-part resins. All these materials have a much higher density and mass than gourd. A patch of fiberglass is like adding a lead weight to the resonator. Heavy patches on gourds work like a bridge damper on a violin. The damper for a violin is a weight attached to the bridge that kills 75% of the sound. (violin students use dampers to practice quietly). Beware of the gourd repair techniques that don't consider the physics of sound vibration in sitar and tamboura gourds, The affect of adding unbalanced mass to resonating gourds, reduces the higher harmonics, as well as damping the bass growl response, The higher harmonic series form the essential nature of the Jawari sound in sitars and tambouras.
In my workshop, we see dead instruments that have been patched with high-mass products. We remove the clumps of Bondo and fiberglass, and rebuild with new gourd pieces. This will restore the instruments lost harmonic resonance.
Below you can see - Before and After- Photos.
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