On my 18 cc the seat bases were a combo of through bolted and screwed. My floor was rotten but my bases never really loosened up. I would think yours were probably installed the same way. You could back the screws out a little and look at the threads. That would give you an idea of how they're fastened.
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1999 Wellcraft 22WA-200 Ocean Runner
1982 Grady White Tarpon 190-110 Evinrude-Sold
1996 Striper 2100WA-RIP Sandy
1989 Wellcraft 18-Sport-125 Force-sold
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