Instructables

Step 3: Add Spring and (optional) Cover

Picture of Add Spring and (optional) Cover
Place the spring over the thread stock, so it’s resting on the top of the backer nut. The spring will provide a bit of resistance to swiveling the sensor, it isn’t necessary. It would feel a lot looser without it though.
I also put a small section of flexible tubing to cover it, this is purely cosmetic. The tubing needs to be cut a bit shorter than the spring. When you tighten this to the rod, the spring will compress and eliminate the gap.