Thanks Geoff, You beat me to it
the Orion Cheshire/Sight tube is very easy to use.
NS I bought the new knobs from
www.Astronomy-Shoppe.com Tony Costanzo is the owner and he is very helpful.
I have a Meade 12" Lightbridge, they are all based on the G.S.O. scopes and share quite a lot of hardware. If you go to the site and click onto
http://www.astronomy-shoppe.com/_der...110_vbtn_a.gifit will show you all the improvements that can be made to just about any dob sold in OZ. It's worth every cent
Cheers, John.
P.S. Delievery is about 10 days.