Thanks Lee. Don't know about moving the mirrors?? Although after a bit of a headache and lots of measuring, it turns out the difference is 42mm, where I only have 6.5mm of inward travel in the focuser
. I have looked at Preciseparts.com, and made up 3 adaptors to fit into the setup. The shortest I can go to make it work eliminates 39mm of this, and leaves me with 3.5mm of extra inward travel in the focuser to play with
The painful part is for the 3 parts it's going to cost me $422!!!