Paul from SWISCO responded:
February 27, 2015
Hello! I believe your hardware will match our Series 900 spiral balance. We use metal tubes, which don't burst like the plastic ones tend to. As for the length, if you got 33-1/2" by measuring from the end of the tube to the end of the exposed spring, then I recommend our S900-34. I recommend weighing your window sash to confirm which of our Tip Color options is best.
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