still stiff

Took a very close look at the input shaft of the baader planterium 36mm 2-inch eyepiece in an effort to determine why the filter would not screw in. It did not look out of round. No flanges or deformations from drops. No bad threads on the inside. A bad paint job? I thought for sure I had used 2" filters before. Alas, the filter still would not thread all the way—and seat. But I was able to get all the visible threads in such that it was usable. I don't think a filter will fall out. Strange.