If it is the Sr, then conversion is simple, and inexpensive. Icrafted ablock, from 1/2" x 2" hardwood, glued it to the underside of the wing, far enough back the clear the cross brace above the windscreen... and drilled two hole for 3/8 dowels, dead center in that block. Glued the dowels in place with 1/2" extending out, and tapered the upper edge to snuggly grip that forward cross brace. That gave the forward edge a clamp. Then, where the aft gussets are on the upper sides of the fuselage, at the rear of the opening, I glued a single 1/4" x 2" hardwood block to span this area. This is where it gets tricky. You have to decide where you want to put the blind nuts, and the bolts, so that they don't overly damage the trailing edge of the wing, yet give it adequate clamping force. Mine are as far forwardin the trailing edge spar as possible, and I use a cut piece of 1/8" plastic to "beef" up the holes where the bolts go through. I simply use the plastic as a "washer", not permanently fix it to the wing. My Sr Telemaster is a float plane, and this works fine in handling the extra dangling weight. Good luck, and if need be, pics can be posted.

Keep your head up on a swivel

Skratchbilt