Miniature 4 mm ratchet wrench

[mklotz]

I discovered that the 0-80 hex head screw mentioned in my original post, while a workable substitute for a 0-80 setscrew, got in the way on some of my smaller models. Not many folks have 0-80 setscrews on hand but I've got them in several lengths and metals. The one I selected, shown in the middle of the penny, is 0.064" in length and 0.060" in diameter. Below it is shown the 0.028" Allen wrench used to tighten it. [Aside: How in blazes do they make the 0.028" hex hole in the setscrew?]



This photo shows the setscrew installed in the adapter and the machine screw it replaces.