This is a wind-up boat, and my 50th model. The only extra hardware is a rubber band, to wind up the other piece. If I am right, them this does work, you put the rubber band around the boat piece model, into the notches, and then around the poles and all the way down on the boat, the piece should rest around the hole of the boat, and if it doesnt, I'll test it again and remodel it.

Like my other models, this probably has to be scaled down to around 10%.

Also, I just added another boat that has a filled bottom but is not wind-up.