I have given up on my opening ports. The lock down dogs keep breaking and super glue gust doesn't hold on the plastic that the ports are made of. I removed the port and countersunk 5/16X1 1/2'' flat head screws were the lock down dogs were with a flat washer and nut to lock the port permanently closed. Everything went so good that I did the second port the next day. When doing this I sealed the gasket with some caulk to make sure there won't be any more leaks. Don't believe we get that much ventilation from those small port anyway. If you are having trouble with your lock down dogs this will take care of the problem once and for all.
ROGER