Eventually it is possible for the abrasive lever to become loose and lose the ability to lock down. This is due to the nuts and bolts that hold it in place vibrating loose over time. It's a fairly simple matter to fix, and the video will show you how.
1. Loosen the nut on the top of the rocker arm.
2. Tighten the bottom nut, pulling the rocker arm back down.
3. Lock down the abrasive lever and see if there is adequate tension.
4. Once tension is good, tighten the top nut to lock it in place.
Keywords: Retension, tension, retention, rocker arm, handle