Re: Hole under the seat post?
The large hole is supposed to be access for a backing plate (ideally) or through bolts. There's a company that makes Half moon shaped plates with holes that line up with seat post bases. Slip one half in. Bolt it. Then slip the other half in with the use of a finger hole to control the plate while bolting. Much stronger than just screwing to the deck. ;)
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Heavily medicated for your protection.
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