Cut F631B and F631B-L straps and beveled edges Layout rivet pattern on F631A aft channels x 4 Center punch and drill F631A x 4 Clamp F631A and F631B parts and matchdrill Disassemble and debur F631A and F631B parts Countersink all holes F631A rollbar and canopy frame bar Re-assemble and rivet aft channel forward half
