Hi Allan, I have a 127mm OTA f9.4 (has mounting rings and dovetail, 50mm finder and 1.25 crappy diagonal that will do at a pinch) that I purchased from AOE (in OZ) and it has a collimatable cell. If you are interested you can have it for $325.00 (includes postage to you). There is absolutely nothing wrong with the scope, it is just surplus to requirements. My email is
blitztraining@aapt.net.au if you want any further info.
Regards
Chris