SCT Collimation without Tools: BOB'S KNOBS
It's easy . . . just grab a Bob's Knob and turn. You can even do it while looking through the eyepiece on most scopes. And you'll never drop that pesky little Allen wrench or screwdriver on your corrector plate, or in the grass again. Installation is a snap with included instructions, and you can undo the modification at any time.
In particular, this model:
Fits: All Celestron 11 inch (28 cm) f/10 SCT versions (metal or carbon fiber tube) with "Trifid" rotary cover Fastar secondary housing.
Knobs: Black plastic, 16 mm (5/8 inch) diameter.
Threads: Black anodized aluminum alloy.
Note 1: The factory dust cover will fit normally with Bob's Knobs installed.
Note 2: Many Celestron 11 inch (28 cm) carbon fiber tube and metal tube SCTs manufactured from 2000 to 2005 have the Trifid rotary cover Fastar secondary housing. Do not use knobs for the Trifid Faster secondary on the flat secondary. The screws on these knobs are too long.
Note 3: The rotary secondary cover must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
Installation instructions are available in English, Spanish, German, Italian and French.