This genuine KFV genuine gearbox is riveted onto strips and need to be drilled and then re-riveted. These cases will only replace newer KFV locks as older versions have different connectors.
Operation: Key Wind
Latch reversal: Depending on date of manufacture either: Push in the latch and undo the screw in the back of the lock case, remove the latch, reverse and reinsert or Push in the latch and undo the screw in the side of the lock case to remove the latch, reverse and reinsert.