My spiral balance is in 1/2" increments

A quick learner from USA says:
I have a s900 spiral balance but my length is 28 1/2", measuring only the metal tube itself. Can I go with a 28" or 29" balance?
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Tom from SWISCO responded:
Thanks for posting! Can you tell me if this is for the top sash or the bottom sash?
A quick learner from Delaware says:
The spiral balance is going to be used for the bottom sash.

The top sash is stationary and does not require any balances.
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Paul from SWISCO responded:
I see you went with S900-28 balance. This may work, but before you install it, place the balance tube installation hole up to the hole in the track. Then, let the spiral spin out to the bottom. If the spiral doesn't hit the sill, re-drill a hole at a lower position until it does.
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