The ThrottleMeister is a throttle-lock cruise control that replaces the bar-end weights. The right-side unit compresses the throttle tube when activated, holding the setting by friction. The left-side unit is just to keep the appearance matching.
Cruise controls are potentially dangerous. This page is for information only, and is not a recommendation or an endorsement. Contact the manufacturer for safety information.
They’re made and sold by Throttlemeister.
I wasn’t really sure, until it arrived, exactly how it worked or how much effort would be involved in installing it. It turned out to be very simple. See my notes and photo-journal of installation here.