Making a Fretless Custom Spring Bass - full build

This bass was planned since last year and we finally shipped it to customer a week ago. He saw a head-stock that he liked from Dan Thompson from "Guns and guitars" so we gave our twist on the concept. The bass is 4 string frettless made from ash, maple, oak and ebony. Thumb-rest and fret-board are made from black ebony, wings from ash, and neck from maple. We blackened the oak veneer by cooking it in white vinegar with steel wool. Veneer was used to make electronics cover as well as thin lines throughout the neck and body. Markings on the fret-board are filled with epoxy resin mixed with white pigment and maple dust. Nut is made from bone. We used pvac glue for all the glue-ups on this project, "patex" for the body and neck and "titebond" for joining finger-board to neck. Truss-rod is a custom made for this bass, I didn't film it because it is the same for every guitar project we have done so far so if you are interested please check any of previous guitar videos :) After machining, bass was sanded with progressively finer sandpaper and 6 coats of polyurethane varnish were applied. First four primer coats were applied to fill all the pores and then after couple of weeks, two hard top coats were applied. in between each coat, the whole bass was sanded with 400 grit sandpaper. After last coat, everything is polished with 3 different paste grits. Fingerboard and thumb rest is oiled with "timberguard" teak oil. Hardware that we used in this build is: Schaller Da Vinchi Bass tuners, 3D-4 bridge, S-locks strap buttons. D'Addario ETW92 strings. for electronics we used SJCSX neck and 35TWX bridge pickups combined with BQC control and ABC active balance control from EMG. Total weight of this bass is 3.8kg. I hope you like the build! :D

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Music:
Recording-mix-mastering :Tomislav Stošić
Composed and played by Fran Slogar

Podcast where I talk a bit about guitars: https://www.youtube.com/watch?v=XatDDaWxcwM

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Intro music: Danse Macabre - No Violin by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Source: http://freepd.com/Classical/Danse%20Macabre%20-%20No%20Violin
Artist: http://incompetech.com/

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