By means of the synchronized stroke display the operator can monitor the detensioning process outside the danger zone. If the detensioning cylinders are not retracted synchronously, a pointer is deflected to the right or to the left via Bowden cables. From the optical aid one can easily see which drain valve needs to be actuated to counteract this oblique pulling of the transverse anchor plate. The operator can also read the total stroke from an additional scale.
There are two fastening possibilities for the synchronized stroke display: