Paul from SWISCO responded:
October 16, 2017
Looks like a homemade non-tilt balance. You can use our 5/8" thick Series 500 spiral balance. We will need the length of the tube and weight of the sash. The bottom bracket would be our 17-012.
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Tom from SWISCO responded:
October 20, 2017
If that information is accurate, you can use the S500-23 with a blue tip.
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