The bar end on the throttle side turns, pushing on the throttle grip and holding it open. You can still move the throttle with it engaged - in case you needed to close it suddenly - but it will hold the throttle open if you don't apply too much force. You only need to turn the bar end half - 3/4 of a turn to engage. Slick.
Really well made, easy to install and reduces vibes.
Really well made, easy to install and reduces vibes.