Corsair,

Usually you will make a 1/8" plywood plate for the gear to mount on and then put 4 3/16" dowels about 1" long into this plate and countersink the plate and drill holes for the dowels in the foam wing. This makes the gear almost bulletproof from pulling out. I will see if I don't have a picture of this somewhere and upload it later... but if you have any questions, this is certainly the right place to ask.

Dan

Carolina Custom Aircraft