For model highly suitable tool. It is important never to press the knob with pliers. If the manual force is not enough to resort to the usual release method to stop, even if it takes longer then. In order not to come in `sweating if you have times less than 2-3 days available for a project (upon exercise of a Hobbies should not be a problem), a supply of Ersatzausdrückstiften is recommended. The one must pay the expressions on the exact position of the tool and workpiece, to be understood.