If the "Mic" switch was removed, be sure to reattach it before putting the PCB back into the case.

Replace the 2 screws used to secure the PCB into the case.

Slot both rubber pieces back into the ends of the housing.

If the plastic clips were broken, apply glue to the marked areas to hold the case closed. Cyanoacrylate glue (superglue) or B7000 glue will work.

Press the case firmly closed and wait for the glue to dry.