PAIR OF TWISTER SPIRALS TO ADAPT 1928-34 THROTTLE TWISTERS TO RIGHT HAND THROTTLE AND CONVERT ADVANCE RETARD BACK TO CORRECT OPERATION.
NOTE SOME WORK IS REQUIRED THE OLD TWISTER BARRELS NEED THE WELDS GRINDING AND OLD SPIRALS REMOVED AND NEW ONES WELDED IN PLACE. (YOU MAY NEED TO SHORTEN THESE NEW SPIRALS ON SOME TWISTERS)