Hi Steve,
I never thought about doing what you suggested so I thought of giving it a try. I rumaged around and found a 2" WO right angle diagonal (a spare kicking around!) and a GS 2" ED Barlow lens (bought only for test purposes) BTW on test with a 6" apochromat it performed exceptionally well.
The ED Barlow assembly unscrews into 3 pieces and the lens cell screws into the diagonal - very neat - but requires the silver tube to be shortened and re-threaded (in work) to suite the 'scope. I now have a "x(you guess) Diagonal" beats all that length before the eyepiece.
Jerry.
