I want to insert and glue 1/16" diameter rare earth magnets into holes I create in my plastic models. The purpose of the magnets is to make it easy to swap weapons/options on my Warhammer 40K models.
Regular twist drill bits leave a wide concave hole in the plastic, making it difficult to glue a magnet flush to the bottom of the hole.
Forstner drill bits create a flat bottomed hole (with a small concave hole in the center), but only down to 1/4" diameter holes.
Brad point drill bits create a flat bottomed hole (with a small concave hole hole in the center and a depressed ring around the hole) down to 1/16", but it seems brad point bits below 1/8" are not a "true" (?) brad point bit.
I have two cascaded questions: 1) does a 1/16" non-true brad point drill bit provide a good-enough flat bottomed hole for 1/16" diameter rare earth magnets? 2) if not, what is a workable method to create 1/16" diameter flat bottomed holes in plastic?
Update 2 Oct 2012: The root problem I am trying to solve is magnets being pulled out of their holes after gluing. I originally thought I had a tool problem (concave hole causing lack of contact surface area between magnet/glue), but CaulynDarr and Affe's comments point to a likely process problem. Experimentation and tenacity on my part will solve that. Thank you for your comments!