Hi,
I got this new from Hutech for my Nexstar 11. Unfortunately it didnt fit but according to Hutech will fit later and current models.
http://sciencecenter.net/hutech/misc/focuslk/index.htm
45 AUD including postage.
I don't normally do this, but if it doesnt fit your scope i dont want it back. It's not worth mucking around for 45 AUD, so read the link I posted and if you think this will fit your C11 and you want it then...
Of course if you live in Sydney and wish to bring the OTA around to try before you buy, then no problem.
Cheers
Paul