Paul,
The thread on the Tak Collimating scope is M36.4P1. If you don't have a Tak scope which includes appropriate adapters, then the Borg #7423 (
http://www.sciencecenter.net/hutech/.../html/7423.htm) will get you to a T-thread. That's what I use for collimating my RC10.
Cheers,
Rick.