This Mod is so 9mm Sq Potentiometer can be used ,,,Theses type of Pot’s will be around for a Long Time,,, There nice and compact and the 18 tooth Spline pattern is easy to print and fits really well on the Printed Parts,, ,,This Design has a — Finetune or Secondary Movement – that is 45Degs +/- which should be Plenty ,,, It took a few attempts to find the right configuration that makes it easy to Use and easy to Adjust ,,,–doing the test prints now,,, hopefully not to many bugs to work out,,,,