Gus, First off ,Iâve never looked at one of those locks up close but, It looks to be a simple lever style lock from the pics. Judging from the chain on it I wouldnât think the internal lever arrangement would very complicated. You might try finding a flat blank key, wax it ,insert it and read the impression on the key. You should be able, without a lot of trouble, make the cuts on the blank to make a working key. Good luck with it and remember to have fun doing it. Mark:8):