Fits:Celestron
9.25” (23.5 cm) f/10 SCT versions with metric screw threads (CPC 925).
Not for C9.25 with “Trifid” Faster or EdgeHD optics (see Item C below).
Knobs: Black oxide steel, 12 mm (1/2”) diameter Threads: Black oxide steel
Notes:
Black
Phillips factory collimation screws usually have metric threads, but
some black Phillips screws have standard threads. Our hints
will help you determine which screws are on your telescope. Make sure
the knob threads match the factory screw threads before installing the
knobs.
These
knobs sit inside the tall lip around the perimeter of the secondary, so
they may be hard to grasp with two fingers. Adjustments can be made
using a thumb or finger against the inside edge of the knob.
The factory dust cover will fit normally with Bob's Knobs installed.
If
your telescope has a factory-installed plastic cap over the collimation
screws, it must be removed and set aside when Bob's Knobs are
installed. The cover is cosmetic only and will not affect operation of
the scope.
