December 30, 2015
Upon measuring the tube with black spring inside I have cracked the tube. I can still twist it at the top, so I think what broke is just a sleeve to cover spring. The tube measures approx 1/2 inch across the top opening.I need the small plactic rod that fastens the metal tube to the bracket at top. The metal tube is approx 5/8 from left to right.
January 8, 2016
the balance spring is located inside the tube you see. The tube is maybe plastic and it did crack but the spring is intack. I can actually twist it and it will unwind. The tube you are seeing is just a cover for the spring. the part I need it the part that goes thru the hole in the bracket (pic 2)nd then thru the hole in the tube (pic 1) see both photos. the picture of the small plastic piece (pic 3)is what came out of the hole, although it must have been longer. I believe it to be like a nylon rod that went thru the bracket and then into the tube that covers the spring , this would keep the spring from unwinding. Someone suggested that I twist the spring then hold it up to the hole in the bracket and then just put a screw thru that into the wood frame around the window.