My concern is that I don’t want something flopping around between the lens and the sensor. I have no problem filing the filter frame but didn’t want to do something irreversible if there was a simple trick that I was missing. Optolong needs to:
1) Respond to their customer inquiries. Absolute silence with my various emails.
2) Adjust their product description or change the design so their customers don’t run into the same problems that I am.
Thanks for your thoughts.
Playing with my other clip in filters, I've noticed that even the ones that have the tiny triangles grooved out, flipping it around to the other side, the thickness of the filter allows it to sit UNDER those tiny little overhanging triangles that are screwed in where you circled in your images.
I found this on my T2i, T6i, T6s, and on my EOS-M adapter.
Did you try pushing the filter under those little tabs overhanging ?
My optolongs are 2" type, but my other generic clip ins, will slide under.
Good Luck and Clear Skies !!