The American manufacturer produces a significant number of rollcontainers for the storage and transport of retail goods each year. Previously, the majority of these swivel castors were imported directly from China and supplied by a US competitor. To ensure that carts can be transported securely on trucks without taking up too much space, the swivel castors needed to have a low mounting height. The lock also needed to be secure. The customer previously used swivel castors with a wheel and swivel head brake. The fixed swivel heads were frequently damaged by the vibrations during transport. The customer also wanted to make the lock more user-friendly. The compact design of the carts and the low mounting height of the swivel castors meant that there was hardly any space between the release lever of the lock and the base of the cart.