A pair of tubular risers each having an upper roller therein at the head end of the frame direct arm cord ends to {HEAD ~ a cord retraction assembly} mounted on {TAIL ~ the carriage} 
A pair of tubular risers each having an upper roller therein at the head end of the frame direct arm cord ends to { HEAD ~ a cord retraction assembly } mounted on { TAIL ~ the carriage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL