filter didn't fit

I brought my Celeston 8" Kendrick (baader) solar filter to the CAO to see if Risa wanted to try it on her telescope. Unfortunately the Celeston 8" Edge has a large rounded ring at the objective end, large enough that the ring of the Kendrick filter would not fit completely over. And then the rivets (I thought they were screws at first) for the bayonet lid stuck out making the whole thing wobbly. Maybe with a bunch of tape everywhere it would stay put, just as a hack. A little disappointing.