The wing was originally rubber banded on. I sawed the mount dowels flush. Add an extra layer of ply wood, extending below and forward of the ¼ 20 nylon wing bolt anchors. I felt I needed to distribute the loads somewhat. I also installed two pieces of arrow shaft in the front of the wing. Made sure I carried them all the back to main spar. I glued a piece of ply with 2 holes drilled for the arrow shafts to front of the spar doubler. I did the same thing at the Leading edge. This ply doubler was cut to the height of the L.E. and extended to the last rib that had center sheeting. I added a piece of 1/8” carbon plate as reinforcing washers for the holes the arrow shaft were to go thru in this doulbler as principally it was inteneded to carry the loads of the hold down dowels (arrow shafts).
I also raised and reinforced the first bulkhead in front of the wing. Were the hold down dowels go thru it, that has an additional thickness of ply add to it.