Hi all, Over the last year I've been fixing up the beautiful old sunfish that I bought(best guess I have is 1970 from the serial number 80853 and lack of an expanded cockpit). I just got around to doing a leak test and have determined the water I keep finding in the boat is coming from the mast step, which has a crack running vertically for about 4 inches. It looks like some pieces of the fiberglass has fallen away too. My question is, can I do the repair without opening another inspection port? And what should I use? I was thinking of using Marine Rx, but thought adding fiberglass might be better. Does anyone have thoughts/experience? I'd greatly appreciate it. I attached a photo of the damage, although it was hard to take a good picture of. Plus a shot of her in action, just 'cause.