Hi Nighthawk,

It might not be the inside workings of tank. You might want to carefully open the transmitter and check that the metal swipe arm that controls this movement is touching the contacts. This is a common problem on HL (we have 3 and they all had similar problems) and easily remideed. Undo the small screw and remove the arm, bend it to a slightly more acute angle then replace. If this still doesnt work then an investigation of the interior wiring may help.

Regards

Mike