I'm looking for ideas regarding the repair of the screw mounts for the forward porthole covers. My repairs have failed twice.

Each screw used to tighten down the covers is connected to a pin that passes through two nubbins, one on each side of the screw part of the inside of the porthole mount casting. There are two screws and four nubbins on each side.

The two nubbins for one of the screws have broken off, and shattered. The casting, I guess, just got old. I need to replace the nubbins, and don't want to replace the entire inside casting.

I have tried epoxy paste (the stuff that comes in a tube) and aluminum weld stuff which is also an epoxy past. The molding is beautiful and works. However, after about two weeks, the new molding pulls away from the old casting. In other words, I can't get the epoxy to stick securely to the old aluminum casting.

Any ideas on rebuilding these nubbins so they stick and can withstand the pull from locking down the porthole covers?