Bob, I have never heard of a book or video on this specific subject.
I think most of us are smart enough not to drill out small
spheres…well except for me. I’ve done a bit of this for some
prototype pieces. I can probably help you out. I assume the beads
are solid. What size are they? Are they drilled already? What size
thread do you intend to tap? Do you want the threads to go all the
way through or part way through?
Happy New Year,
Metalsmith, Computer Geek