The devil is in the detail: Again! And the devil already knows our pikchain.
There are quite a lot places in our pikchain where he can hide and wait until you discover him too late. One of theses places has been found recently and the devil was amused!! When you build the frame of your pikchain without any possibility of finely adjusting the guide rails (horizontal and vertical), then it may happen that different tolerances add in such a bad way that the pikchain sticks between the rails and can’t move anymore. In this case you have to modify your frame, which can be very cost ineffective and time consuming.
The easiest solution consists of having a design with oblong holes. Don’t give the devil a chance.