sort off, , as Ive fitted a loop coupler onto my ragleth loco,   It used a coupling cut from an lgb swivelling wheelset, as found on most wagons.
  
 Just remove the accucraft coupler bolt/swivel and remove the coupling
  
 I then just sanded down the lgb coupler intill it fitted in the  empty coupler box, and adjusted the height by using plasticard shims.