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I had the same trouble with the 8" GSO newt (with standard R&P focuser) I use.
A bit hard to explain but I had to unscrew the 2" section off the top of the focuser, make an aluminium spacer ring to fit inside the drawtube & then fit a standard 2" - 1-1/4 reducer. I believe the previous owner Eric fitted a moonlite (or something similar) to overcome the problem.
I wouldn't have a clue if you can apply the same method to a crayford.
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