Same style plastic knobs are simply unavailable, plus why would you
want them they are likely to break again the same way.

You can find direct replacement aluminum knobs these give you more
control since they are larger here
http://www.mercurysupportsystems.com/

or extra large plastic knobs that like the aluminum above give more
control here
http://www.scopestuff.com/




(Mark Pippin) wrote in message . com...
I have a Celestron SP-C6, a 6" f/5 reflector made in Japan. It works
well with a CG-5 mount,and it's a great public star party scope for
the Moon, but the focuser knob needs to be replaced. I tried Ace
Hardware but no luck. The knob is about 3/4 inch in diameter, is
threaded inside for the focuser shaft and also has a set screw.
Unfortunately the plastic near the set screw is breaking down and it
won't hold tight while the focuser is turned.

Does anyone know a good source for a replacement knob for this scope?
The shaft is quite small for the size of the knob.

Thanks,
Mark Pippin