The mounts are actually Makita RT0700CX mounts designed and generously shared by joeskilton a fellow forum member. Link. http://www.thingiverse.com/thing:1008647
It was a last minute “quick fix” with a couple of silicone o-rings to attach the pen. I had always planned on printing an adapter to mount a sharpie in to the mounts properly, but the o-ring trick works so well I don’t think I’ll bother.
I’m working on my spill board now, glue will have to set overnight, then tomorrow I’ll set up the mill with the RT0700CX for the first time and let the MPCNC drill its own holes for all the threaded inserts, and “deck” the spill board if I can hunt down a suitable milling bit.
I’ll post some updates when I can.