Here's my prototype conversion block. I designed the conversion block to replace all of the moving parts with a solid block which acts like a stop tail. The vibrato arm is non-functional and is attached for cosmetic reasons only. My goal was to replace everything between the mahogany slab and the diecast string retainer with a single solid block. The block has the same footprint and mounting hole locations as the original vibrato unit, so it it won't make any new impressions in the lacquer and the mod is completely reversible. The prototype part is doing a great job of keeping the guitar from slipping out of tune. The prototype is a 3D printed part made of titanium. it worked well to prove the concept, but its a little rough and the titanium is so hard its very difficult to work with. i've made a few refinements to the design and I have CNC machined aluminum parts in the works that should be completed within a few weeks.