S&G padlocks are evil. They are hateful devices. The inner working are broadly similar to the full-sized dials but are fiddly little demons. Changing their codes never goes properly, and recovering from a lost code requires multiple special keys. I know of boxes containing dozens of "bricked" S&G padlocks that people have given up trying to use. The difference in design and build quality makes it hard to believe both are made by the same people.