I have a Toro 48" ProLine fixed deck walk behind with a cloth bagger. I stored the bag hanging from the handle all winter, and now when I go back out to mow it is leaking like a seive from the top gasket. Had anyone experienced this before and how should I reseal the bag? The gasket doesn't look misshappen, just that it is no longer fitting tightly and man it is making a mess of the mower and spitting little bits of grass all over me! Thanks in advance!