Do you have the "lip" hanging over the front? Another possible problem.....did you wipe it down with lacquer thinner to clean it up? That will swell the rubber, but if you just let it dry for a day or so, it will shrink back. Getting it back in place has always been a 4 hand job for me, to get it in place and whe WS up without pinching or crimping it. In other words, it takes 4 handjobs to get it right.
Heh,
ed