jpianalto a regular drill will not touch those set screws. You will need a carbide drill to deal with those set screws. Set screws are usually a grade 8 or better on the hardness scale. I have in the past used a T-10 Torx bit and hammered it in the set screw hole and use a vice grip to back it out. Not sure about the Torx size best bet would be get a new 1/4 20 set screw and see which Torx driver is just a hair bigger than than the hole. It's worked for me in the past.
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