I just bought a 2nd set of weights for my Scotty Del Mar. The problem is that when I try to remove the original 15 gram weights I am unable with a reasonable effort to get them to loosen. With other situations like this I would normally use something like Liquid Wrench to loosen the seal that might have developed in the threads. Of course, I am hesitant to do this as I'm not sure if I could damage the finish and I believe the original weights have a rubber gasket that may not like the chemical.

Any hints on how to address this?