To make the final fit of the F-710B to the F-710 bulkhead I clamped the bulkhead to the bench with a piece of wood to hold it flat. I then gradually adjusted the ends on the belt sander until the vertex of the angle stock was flush with the top of the bulkhead as shown in the plans. I clamped both pieces securely together and match drilled the F-710B using the F-710 as a guide. I cleco'd the parts together as I went along. After all holes drilled I disassembled and deburred all holes in both parts.