Hi Matt
I’ve got no experience on the M250 with its motorised secondary, but I found the following stuff from the RCOS website to be useful in just gaining some back ground knowledge as I found it all quite daunting initially.
http://rcopticalsystems.com/support/
Scroll down to the bottom of the “Archived On-Line Resources” Table for the “Collimation Video by Ken Crawford” which shows an RCOS being collimated using the Tak Collimation ‘scope.
I found my M180 Secondary Allen Key bolts to be very tight and difficult to turn and so I replaced them with a set of Bob’s knobs. A couple of years later one of the heads sheared off so I removed all the Bob’s knobs and replaced them with the original Tak bolts and now use the Allen Key to make very fine adjustments.
I haven’t touched the collimation in some 5 years now and it seems to hold up very well.
http://rcopticalsystems.com/support/...ollimation.pdf
Above opens the pdf in your browser.
Cheers
Dennis