Thule Acutight Knob

"The Thule AcuTight knob is an innovative accessory for rear-mounted bike carriers that has been specially developed to make mounting your bike safer and easier. Equipped with a built-in torque limiter, the knob ensures that you always apply the correct fastening force. As soon as the optimum torque is reached, the knob emits a audible click, giving you the assurance that your bike is mounted correctly and securely."
"Thanks to the controlled torque function, both over-tightening and over-loosening of the bracket is prevented, which not only increases safety but also protects the bike frame. The ergonomic, soft grips of the AcuTight knob also make handling easier and make attaching and removing your bike a comfortable experience"
"The Thule AcuTight knob is compatible with all rear-mounted Thule bike carriers that have frame mounts. It replaces the standard button and offers a significant improvement in terms of user-friendliness and safety"