Yeah, the strange thing with Colin's scope is that it doesn't have a standard 2" focuser
The focuser barrel is actually about 2.25" I.D. instead of 2" I.D.
Where the 1.25" adaptor fits into this wierd focuser barrel is only about 10mm deep with a stopper lip, whereas normal 2" focusers don't have any stopper. They are 2" all the way through.
I've never seen a focuser like this one before, and it is stopping Colin from using 2" EP's.