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Peter from London UK
Thanks for the question, Most of our padlocks have instructions on the packaging of how to change the number from the factory setting of 0-0-0-0
if that doesn’t help we also have many videos on youtube showing step-by-step instructions. Just search on youtube for amtech and the stock code ( on the packaging)
If you have thrown away the packaging and do not know the stock code, send a picture of your lock to email@example.com and i will gladly email you back with the link to the correct video.