Correct length for a S900 Spiral balance

A home owner from Owasso, Oklahoma says:
The length,(the best I can tell from measurement of the broken spiral balance)I need to replace is 28.5" Should I order a 28" or a 29" spiral length from Swisco? We look forward to your speedy reply.
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Paul Sr. from SWISCO responded:
Are you definitely just measuring the metal tube (sometimes plastic)? Do not include the colored tip or the internal spiral spring in your measurement.
A home owner from Owasso, Oklahoma says:
The length of the assembly, LESS the colored tip and the internal spiral spring, is 27 3/4".
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Mike from SWISCO responded:
Make sure you're only measuring the tube portion of the balance before you determine what length you will need. For example, I have added an image below that shows the proper measurement of a 10" spiral balance.
Image displaying how to measure the spiral balance length.
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