Mount the gear legs as you normally would. Plan on the nuts being on the outboard side. Where the tripler will be over the inboard leg, releave enough wood so the tripler can be epoxied securely, the transfer the hole locations to the tripler. At this point, drill holes where the bolts are so that they can fit through and the bolt heads seat against the gear leg. Fine tune the fit so that when the bolts are removed that the gear can slide out for finishing and servicing later on. For the holes to look nice, you can sleeve them with any kind of tubing so that they toughen up the area so you don't dent the wood putting screws in and taking them out. Just make sure the tube is big enough for the heads of the bolts. When sanded off, and the model is dope and painted, it helps give a more finished look to the holes.
Type at you later,
Dan McEntee