This component can be retro fitted to a TRA07 and a TRA28A master or Scenery carrier  to enable the carriers on a curved track to be cord operated. The arm is designed to bolt to the holes on either the side of the scenery carrier. The vertical part of the arm carries a rope clamp positioned  to divert the cord from both directions up to the clamp. The arm is designed to position the clamped rope on the cord line and permit it to pass between TRA and UBM19 capstan pulleys.

TRA8002 formerly TRA28ARM