At this point the wing tips were drilled to 3/32 holes and attached with clecos. I stepped these holes out in two steps to .190 for the final mounting screws. Installed MK1000-3 on the top flanges per the instructions. I also started fabricating the seat pan spacer foam blocks. I decided to try spray foam (household) to create the blocks. My thought was I would have perfectly formed bliock by letting the foam expand agaist the wing bottom skin and the seat pan.