HELP!!!

Alright.....I am sure this has happened plenty but I can't seem to fix it....I have a early 60's 10' log that I love....but I need to change the fin. Somewhere during the lifetime of this board, before I became the custodian of it, someone had a fin box put in the board so they could interchange fins. The problem is, the fin on there is WAY to small and I can't get the screw busted loose to change the crap fin out. Rust has completely taken over the screw....you can barely see where the slot is for a screw driver but it is impossible to get the thing out. ANybody got any magic up their sleeves? I have already tried WD40 and PB Blaster. Any help would RULE!!!!

You will probably need to "tap" it out..

You need to drill a small hole then you but the tap on a drill and reverse it out.

This has to be done first with a tiny drill bit, then a very small drill bit then the tap...

CB

Ok, that sounds pretty straight forward. Probably not as easy as it sounds but we shall see. Thanks for the tip Ben.