Not sure if this topic has been raised before if it has I apologise. Its easy enough to get the cheap not even sure if they are actually brass integral locks that fit in the Holy Trainer and seemingly a thousand other chinese knock off devices. It seems they all operate with one or two keys. The metal of the locks especially with the PA padlocks does appear to degrade quickly and wear out, get stuck, get cruddy easily etc If there really are four levers in these locks then there should be 24 different lever arrangements all requiring their own keys. So please ....Does anyone know of there being replacement locks with the same dimensions that do have more levers and therefore a greater number of possible keys.. and that are made of stainless or titanium?