W. Watson wrote:
I have a Necky Zoar LV and the cover (neoprene?) for the small hatch
seems to have shrunk. It takes 2 seconds to put the front one on and 60
seconds for the small one. Any way to put some stretch into it other
than just leaving it on for a long period?

Just leave it in place. Any stretching method more Draconian than that
is likely to damage the cover.