I've seen these for sale in a few places.
They essentially turn your FR bar into an Ibanez Edge kinda thing, which I've always liked the feel of.
Are they worth it or is it better to just grab a Schaller bar?
Having two guitars with the push-in style arm now, black and chrome, it turned out that chrome was a way looser fit. When I tightened the set screw, enough to eliminate play, the arm wasn't as easy to move as the black one.
The right fix is to use fine machine oil, aka 3-in-1 oil on the shaft...