Martin Logan tranducer panel slipped

I have the Odysseys and have had one panel slip down about one half inch. I called Martin Logan about this and they sent me two clips to keep this from recurring after I got the panel back in place. The trouble is that I have been unable to get it back where it belongs. I leaned the speaker back and placed a support under the panel and let it back down on this piece of 2X4, put pressure down on the frame and it didn't move. Hoping that if it was left under the pressure of the speaker's weight for awhile, it would eventually return to its normal location. It's been 3 days so far and hasn't moved a millimeter. It had to have slipped down on its own so i don't understand why, even with some force it is so difficult to relocate. Any ideas?