seanburg,

I changed my wire mount on the top wing to bolts on the CG Ultimate.

On the bottom of the wing I did some surgery and placed basswood blocks in the same location as the bolts holding the metal bracket that the wire slides through on top the cabanes. The blocks are curved on both sides to fit the airfoil and fill the area top to bottom to prevent smashing the wing when tightening. The blocks are about 1" wide x 1-1/2" long.
After resheeting the area, I made two small "wedge" pieces that conform to the wing and cabanes and did away with the metal piece that holds the wire mount. With 4x40 bolts and dime sized washers (made from ply and covered to match) the bolts go through the top of the wing and bolt onto each cabane with washers and nuts. Its a little more of a pain to assemble it but its been working well for the last 6 months.