I have the Bintel (GSO) 8" F4. The only thing I collimate it with is a cheap Cheshire eyepiece that I got from Astro shop. The 6 mirror screws are a silly way to do it but they work. Once roughly collimated, I tighten the locking screws to tweak final collimation and lock it in place. Surprisingly, doing it this way my scope has held collimation since I got it in December. I want the 10" F4 next.
