Thanks FJ,

I thought of your fix & may do it yet. I mounted them back up the next day, following thorough cleaning and everything appears nice and snug. In retrospect, I should have weighed the filters before and after on a gram scale. Apparent weight told me two things, they do trap a lot of "dirt" and I shouldn't have waited so long to clean them properly.

JH

"It's not what I say that's important, it's what you hear" Red Auerbach