Carbon fiber wing tips from Bob Barrows--very good fit out of the box. However, in order to install flush with the wing skins, a few extra steps are needed. First, the rivets must be drilled out of the outer rib. Next, an aluminum strip is inserted between the rib and skin to form a backer for the wingtip. Strips are match drilled & dimpled to receive rivets. A bit of trimming/sanding allows a tight fit to the wing. More match drilling: this time, through the carbon fiber and backer. Nutplates in the backing strip will allow for easy removal of wingtips at inspection time. Cargo straps provide an extra hand while snugging the wingtip up at the leading edge.