Hi, I didn’t replace my seals but I decided to attach my (woody) hatch with M8 bolts sticking upwards. They are kept in place by nuts which are countersunk. When I put the hatch on, I then attach washers and the M8 dome nuts. I only have 4 so the sealing won’t be perfect but I’m assuming it will buy me time. I have done this since I knew someone whose hatch had come off at sea during capsize so I wanted a bullet proof solution. I keep a spanner and tub for the nuts and washers handy in the boat.