MinnFlyer has a NICE explaination except he left out one point... you usually need to reinforce the LE in the area of the dowels. This is especially true of .60 size ARF trainers getting this conversion!

A .60 size kit that has the option of either bolt-on or rubber band... the Great Planes PT-60. If doing rubber band mount the structure is the same at the center LE of the wing as your ARF. If doing the bolt-on wing, you have a loead bearing block that is 3/4 inch front to rear that fills from loweer sheeting to upper sheeting at the leading edge. This block is full width from the root rib to the next rib... it gets epoxied in place. The kit supplies a 1/8 aircraft ply plate and medium balsa for making that load bearing block.