SWISCO - The Replacement Hardware Authority

Spiral Balance Measuring Question

A home owner from Abingdon, MD says:
I am replacing damaged spiral balances for many of the windows in my house. I know which pivot shoes to order, but need some help with the spiral balance. I currently have the Red tip series 600 balances installed in my windows. When I measure the rod it comes out to 28 3/8. This is measuring from the top of metal rod to the bottom and it does not include the red tip or end piece of spiral balance. Should I go with 28" or 29" spiral balance? The other question would be should I stick with Red or is it okay to upgrade to the Blue tip spiral balance?
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Mike from SWISCO responded:
It is recommended you use a 28" spiral balance in this matter. The blue tip will hold up longer than the red tip balances.
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