While I am sure there are many tips that others have, I found a thin hot soldering iron pressed into the iron screw socket head will sometimes add enough heat(expansion) to get things going. I have also filed cheap jewelers screwdrivers into an appropriate sized chisel point and, using friction fit, tapped them into the end of the reamed out set screw with a small hammer. This can then be grasped with a small pair of vice grips and the screw may give.YMMVJeff Kruth?In a message dated 2/1/2021 2:46:57 PM Eastern Standard Time, snapdiode@... writes:?
They are typically 1/20" or 0.050" keys. Sometimes it's Bristol drive but if someone forced a hex key in there it's probably not a Bristol drive anymore.
Unfortunately I have found no way to extract a stuck set screw of that size. You might try a 1.3mm key, sometimes they really are 1.3 and not 1.27 so you get a bit more grip. I don't know, seems random.
