I managed to rebuild one of these locks some years ago and still have the tool that I made to do it. Happy to offer advice if needed. The locks are not horribly complicated as they only have one rest position so only a single set of pins. Fired up with my success on a 401 Zeni door lock I moved on to a 410 petrol cap lock and very quickly gave that up as a job for someone with more patience than I.
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