Oh, a lecture demo! I used to assist on those... The alignment for a three-ball bounce can alsoI am aiming more for something like
I have been happily working on (much) simpler machining projects. As is typical for neophytes, one simply doesn't know yet what is doable and what is not. Now that I have three years of futzing behind me I am embarrassed to have even thought of such drilling. Though the idea of exploring annealing and hardening does have a draw. If I ever get back to some variation on this project, I'll let folks know. -BillHopefully, he already has it done by now. But, he gave up drilling ball bearings in post #20 in 2017.
Tom