The 9.25 doesn't have the shipping lock threads unfortunately. I used to use one of these and a SCT Crayford:
http://www.sciencecenter.net/hutech/misc/focuslk/index.htm\\
It helped a bit, and the crayford is a must I reckon, but this solution is the best I've seen.
http://www.marsastro.org/presentatio...irror-Lock.pdf