Tapered Nut
Short circuit is a common issue in electric creasers. I have narrowed down one of the causes. The steel center rod that goes through the brass body of the creasing tip can misalign and bend slightly with constant use, especially with high pressure. The two brass nuts used in common electric creaser tips are cylindrical and a little too close for comfort to the internal walls of the creasing handle screw mount. A slight misalignment can cause the cylindrical brass nut to touch both the cathode and anode at the same time, sending your machine to an early grave.
This is my solution:
Custom manufactured tapered nut made from steel.