23" SERIES 500 SPIRAL BALANCE

A home owner from Florida says:
I need to replace many balances. I need help identifying the correct model. These are spiral balances, 23" long measured as indicated. They don't have any color caps. See the pics. Thanks.
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Tom from SWISCO responded:

You have an older style spiral balance that isn't made anymore. We usually recommend using the S500-23 to replace it, along with a bottom bracket like our 17-007. You will need to weigh your sash on a scale and refer to the chart on the S500-23 store page to determine the proper color tip option to select.

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