The thread on the Tak Collimating scope is M36.4P1 male. Vixen used to have some adapters to fit but they don't make them any more. The best option I found is the Borg #7423 adapter (
http://www.sciencecenter.net/hutech/.../html/7423.htm) which will let you attach the collimating scope to a male T-Thread. Alternatively, if you happen to have a Tak refractor lying around then you probably have a suitable adapter already (one of the widgets used for 1.25" eyepieces has a M36.4P1 female thread).
Cheers,
Rick.