Some late model Celestron CPC 9.25" SCTs have different spacing than the
original C9.25 family scopes.
For our counterweight and piggyback rails to fit, there must be accessory
mounting holes on top and bottom of the end cells of the scope. Please
let us know if you have a scope that does not have any accessory mounting
On the rear cell center line there should be two holes side by side, spaced
1-3/4" apart. These are threaded 8-32 holes.
On the front cell center line there should be a single threaded hole. If the
front holes are spaced 17-3/8" from the rear holes, select the telescope type
"Celestron C9.25 OTA's". If the front holes are spaced 16-1/2" from the rear
holes, select the telescope type "Celestron CPC 9.25".
The three accessory mounting holes have dome-head or round-head
screws in them that can be removed to mount accessories.
Don't remove any screws from your Celestron 9.25" OTA until you are
certain that the rail holes line up with the screws!
Never remove any flat-head countersunk screws from the OTA!!