The Hobie 21 built in the USA...
There is a stainless pin on the keel (front of the well) that the board pivots on. You will have to untie the handle. Remove the two screws from the pin and lower the board out of the hull. You will then see the springs which attach to the aft / upper corner of the well. The springs hook onto a bolt up there. Access to the bolt is through the inspection port.
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Hobie Cat USA