On the pedestal seat bases: I have one on my glass boat that is supposed to be stainless. It is not completely, and the rust seems to be causing the hole in the plastic bushing to shrink. You may have to unbolt the base and put in a press to remove. Then take a 3/4 drill or preferably a reamer and run it down in the hole. My bushing is solid plastic. I notice that the new base I just bought, it is not solid, and instead is sliced so it has fingers. I don't think I'd recommend drilling that type.