I've measured the end of my laser meant to slide into the focuser, and found it undersized. It measures 1.246" with a digital caliper, and 1.247" with my dial caliper. The real eye-opener though, was the grossly oversized opening on the 2 focusers I've measured. I use 1.25" low-profile helical focusers on my smaller scopes and one of them has a 1.256" opening. That's about a ten thou. difference between laser and focuser, and far too sloppy. If time permits, I'll mic the two precision focusers I have over the weekend, both 2" Wyorock low-profile Crayfords. Hopefully we'll see better results. I'm thinking of machining a new end for my laser, should be an easy project. Maybe just a precision adapter- that would alleviate having to modify the laser itself.