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If it were me, I'd get in touch with the supplier and ask him how it SHOULD work...sounds like a B*&^%$ arrangement.
I think a "std" 1.25" UV-IR filter would fit in the extension.....
(Edit) Reading the web site's sales blurb...it says the 1.25" extension is threaded for filters....not that it takes the filter you've just removed!!!
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