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Old 07-20-2017, 06:02 AM   #1
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The passenger seat in my 2007 2100sc3 wobbles.
The pedestal is solid and the screws to the floor are tight. It seems that whatever it bolts into underneath is mobile.
Does anyone know what the structure under the floor is and how to investigate/address the issue?

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Old 07-20-2017, 02:00 PM   #2
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The pedestal base should be bolted, not screwed. If it's tight on the top of the sole (floor), I doubt it's loose underneath the sole. Your sole is fiberglass and resin encapsulating marine plywood. Do you have a locker in the sole? That would be the way to gain access to the underside.
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Old 07-20-2017, 03:13 PM   #3
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Thanks Shrew

My mistake. The base is bolted. The wobble seems to be the floor flexing under the pedestal.
I don't see any obvious access to this area. I do have a ski locker in the center and a locker under the rear bench which begins about a foot away but they don't communicate with the area under the seat.
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Old 07-20-2017, 05:02 PM   #4
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Typically the pedestal is bolted on prior to the deck being installed and access is not built in, common among all boat builders. I would drill a small access hole near by and use an automotive borescope to have a look. You may have a rotten core (plywood that shrew mentioned).
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Old 07-21-2017, 06:17 AM   #5
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The floor of this boat is fiberglass. Is there wood underneath? I will explore further. I think the best way to look is to take out the pedestal and make an exploratory hole in the center where the pedestal mounts to scope around. Alternatively I could get access through the front of the port storage locker.

I suppose if I find rot all of the affected area needs to be removed and replaced which sounds like a nightmare. Is rot likely to be obvious or am I just looking for signs of dampness?
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Old 07-21-2017, 12:21 PM   #6
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Shrew said the deck has enclaspated marine plywood so yes there is wood.

To remove the pedestal you will need to have access to the nuts underneath which you said you don't have. Do you think it's possibly to drill a hole in the ski locker to gain access?

The wood will be wet, dark, and may crumble.

Yes it's a big job.

How much wobble are you talking about? Any on the other side?

If you bounce on the deck near this seat does if flex?
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