member also has an angle measuring device that measures an angular position of the sensing member which is proportional to the compensating radius to be detected application_number US 91091792 A description referring firstly to fig1 shown therein is a main shaft 1 of a balancing machine with associated wheel clamping and centering arrangement comprising a clamping flange 2 which is non rotatably connected to the main shaft 1 a cone 7 and screw on bracing elements 3 and 4 the machine further has a sensing means comprising an extensible sensing member in the form of a lever 10 which in an initial or rest position is oriented in at least substantially parallel relationship with the main shaft 1 and which has a sensing tip as indicated at 11 which can be pulled out or extended in the direction indicated by the arrow a in fig1 the lever 10 is mounted pivotably by its one end 17 about a pivot point for example a hinge which is arranged in stationary relationship relative to the main shaft 1 through an angle which is dependent on the position of the sensing tip 11 for example the angle indicated at w in fig1 into a position shown in broken line and referenced 10 39 the angle of pivotal movement of the lever 10 is measured by means of an angle measuring device indicated generally at 24 which can have a rotary potentiometer in that arrangement a.