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 ma