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Hi Alex,
I get around this by having a 52mm to 48mm step down ring threaded to the bottom of my Feathertouch focusers on each scope; and loctited permanently in place. I just screw the filter on to the bottom of the focuser from the front of the scope then change between 2" and 1.25" eyepieces at will.
Maybe you can make something up to fit on the bottom of your focuser drawtube.
Cheers,
John B
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