Finally received my new bellows in the mail today from Mac's. I'm planning on using a hot-knife to cut the old bellows from the two end plates, so as to not bend or distort them. Also planning to heat up the new rubber bellows in the sun, or with a heat gun prior to assembly. Should there be any sealer/sealant applied where the rubber bellows meet the end plates to avoid vacuum leaks? Or should it fit snug enough to seal sufficiently as long as the end plate sealing surfaces are cleaned up properly?