Bobs Knobs - KNOBS FOR CELESTRON 9.25 inch (23.5 cm) f/10 SCT WITH STANDARD COLLIMATION SCREW THREADS (NOT FOR CPC 925)

COLLIMATE YOUR SCHMIDT-CASSEGRAIN STYLE OR NEWTONIAN STYLE TELESCOPE WITHOUT TOOLS

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 into the grass again. Installation is a snap with the included instructions, and
you can undo the modification at any time.

Fits: All Celestron 9.25 (23.5 cm) f/10 SCT versions with standard 6-32 secondary screw
threads (not for CPC 925)

Knobs: Black plastic, 16 mm (5/8 inch) diameter

Threads: Black anodized aluminum alloy

Note1: The factory dust cover will fit normally with Bob′s Knobs installed.

Note2: Knobs include a set of long spacers so they clear the secondary housing lip. 

Note3: Celestron 9.25 inch SCTs manufactured prior to 2006 have standard 6-32 collimation
screws and require knobs with standard threads. These telescopes can be identified by 1) no
writing inside the secondary housing (except for the serial number); and 2) most have silver
factory collimation screws. Do not use metric knobs on these telescopes.

Note4: A few non-CPC 9.25 inch scopes manufactured in 2006 have black Phillips factory
collimation screws that aren′t metric. If your scope′s secondary housing looks like
this, it requires knobs with standard threads.
 
Note5: The CPC 925 SCT requires knobs with metric threads. The CPC 925 secondary can be
identified by 1) a factory-installed plastic cover over the collimation screws; 2) black Phillips
factory collimation screws; and 3) brand information on the inside of the housing. Do not use
these knobs on the CPC 925.