Or, just make your own tool with a wooden (not bamboo) chopstick. Hold a needle tightly with pliers, make a hole in the center of the small end of the chopstick with the needle, pull it out, cut needle to length, put a drop of CA in the hole, insert the cut end of the needle, maybe another drop of CA at the top of the hole, and you’re done!
I haven’t owned a Hart voicing tool for years because the set screw being so small that the allen key to fit the screw head is so small and weak that the hexagonal corners always get sheared off, leaving no way to tighten nor loosen the screw.
The Hart spring tool, however, is indispensable!
Joe Wiencek
NYC