This one is very easy to do. First bend the tabs of the back cover so that it can be removed easily. After that turn the shaft all the way clockwise. Remove the back without moving the shaft and place a mark right before where the contacts are on the resistive material. That would near the wiper on the left(looking at it from the top, also known as lug 3). After that I used a sharp utility knife to make the cut. Here’s how it looked.

And that’s it! Put it back together and test it with a DMM(if you have one).