I just bought a 1967 nuova500, and need to repair or replace the door lock on the driver's side ASAP, as it is parked in a public place. The button on the inside will not push down fully, and the key turns on the outside, but does not lock the door. The passenger door seems to work OK. From looking at it, it seems I must remove the panels covering the inside of the doors, and see what I can figure out from there. Any suggestions or your previous experiences appreciated.