Before we re-atach the floor and sill asemblies, we make any necessary repairs to the lower areas of the forward bulkhead. Several of the 10/32 screws holding the heater flaps on were wrung off during the disassembly – it’s common and unavoidable… All of these wrung off bolts were drilled out, and EVERY SINGLE THREADED HOLE in the forward bulkhead is chased with the proper tap.