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Thanks. The main part I was interested in was what happens at the ends of turning it. I had a NE555 module with one of these and wanted to turn a specific frequency and ideally pwm. When I kept turning the screw in one direction the freq on the oscilloscope would oddly go up and then down. Not really sure what was going on, but thanks for the video.
I haven't looked up how they work internally for a while. I know that the screw should keep turning when you reach the end and reengage right away when you turn in the opposite direction. I think that if you keep turning it in the same direction after you reach the end, that it will probably keep contacting slightly different parts of the resistive element.
Can't really make a trimmer to have more fine adjustment. You can put a low value trimmer in series with a fixed value resistance that is most of the resistance needed, and then use the trimpot to make smaller changes with less range. If that is a possibility.
