It is not completely free turning. It can only turn about 45 degrees, but it feels like there is a small click in between the two outer positions, so it might be a switch with two or three positions.The 2 schematic diagrams on the BBELTSPOLE device have nothing to do with this radio. Dobbetspole makes sense, 2 variable air caps and a tapped or dual inductors for tuning. Is the can a switch and not a free turning shaft as on a potentiometer? How many switch positions?