I have Gargraves flex track 17 1/2" radus or 35" dia. curves at the center rail. I bend it around a round drill press table set on a table. The track is springy get it close to the corect radus, saw off the ends to get straight across ends. Its hard to get the ends of the curve to be the correct curve. I sawed 3 grooves to fit over the track in a stick of wood and use this tool to bend the curve to be correct on the ends of each Gargraves piece.