Forgive the slight digression [‘though I am actually returning to the title of this thread] …
Someone on the microbehunter forum was pictured using this drill & tap guide, patented by Bruce P. Rooney and currently available in the USA
I think it worth sharing:
**LINK**
https://patents.google.com/patent/US7131796
and also this, for a related version:
**LINK**
https://patents.google.com/patent/US9751133B2/en
MichaelG