Can I, or can I not, drill out the bleeder screw on the rear caliper without damaging it? can I take it apart? -little history about me, I am a retired machinist, and I have access to all the equipment- So, with that in mind, can I, or can't I?

 

I have never attampted it but heard it can be done.Try letting it soak for a little while.Then if you have the reverse drill bits try using them and it might back out while drilling it.