I quit using pan covers along time ago. I figured if a fox was working a set and just did miss the pan his claws might have the chance of hooking the screen and making a mess. I did try fiberfill this year with no problems but might not do it any more. May be a scent contamination thing there. I sift all my dirt and bed right to the edge of the pan. IF the pan moves at all it fires. I still have the pan adjusted for some weight be required to fire it but if it moves any... ANY... it fires. I usually don't redo the set after a rain unless it rains hard or for a long time. Ray