just went and got a simple butterfly style mic clip, the butterfly end grabs the disc firmly and the other end is a standard mic mount...
I'm going to touch up the blackfelt and when my mics arrive I am going to determine exactly how I want to attach my mics but this was a *very* easy project that probably cost me $20 in parts, all of which were easy to find.
the disc is 8" and just over 1" thick...