Greg,
There's no fittings on the tube at all to allow a third party finder. If this didn't work, I was going to just get a Telrad. But, even then, that would be difficult to use with my current configuration (guidescope).
So, he's sent me a collar and I have some very rudimentary instructions on how to install it. I just have to ask, and, he'll send me photos showing how it's done. I am sure I will figure it out!
Gavan, Gilman is the representative from North Group that a few of us have been dealing with. Do a Google search for "ali baba ed127" and you'll find them. His email is
hioptic@gmail.com
Hope that helps!
Regards,
Humayun