It depends on how damaged the hole in the Starboard is but you might get away with using an acrylic thread locker like Vibra-Tite. You can order it from McMaster Carr http://www.mcmaster.com/#75145a68/=10jeduk

You say through bolting won't work but have you considered drilling out the Starboard and using a binding post on the top? McMaster has some stainless steel binding posts http://www.mcmaster.com/#stainless-steel-barrel-nuts/=10jeeys