When the directional Teleco aerial is up the polarisation twist control seems disconnected and has no effect. The antenna ends up in the vertical position and has to be physically rotated flat to lower it. It can still move a bit when driving..not good. Is it easy to re-connect the mechanism and if so how? Should there be a 'stop' at each end of the rotational range? Also the white plastic button controlling the gain is detached; is there an easy fix for that?