[sdcantrell56]

Originally Posted by lemiant

We don't have a bellypan at all at the moment, just a frame, so that may indeed be the cause.
Would 1/4" lexan do the job? Or does it need to be stiffer?

Try a sheet of baltic birch plywood in 1/4 or 3/8" thickness. If you want to spend more money we have become particularly fond of XX grade garolite in 1/8" thickness