Apco Tube Balances

A handy person from Columbus Ohio says:
Windows say apco. Sash is around 18lb. Metal tube is around 34?, outer plastic is 35?. Fully extended its 68? from screw hole to pin. Outer plastic tube is 9/16? dia
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Mike from SWISCO responded:

If you have a tilt window with an 18 lb sash and the balance tube is 9/16" x 35" (the plastic tube only) then you can use S600-35 with a red tip. Let me know if you have any other questions!

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