35" Series 350 Channel Balance

A quick learner from Titusville, FL says:
I have single hung dual pane PGT aluminum windows about 8 years old that have balancers that are failing explosively flying upward and flinging pieces out as they "blow". As best I can tell by your pics and an entire spare balancer I found when I bought the home, mine are similar to your 35" Series 350 Channel Balance but I can't determine the sash weight range. The channel has "86 34-9 AC5 CMC" imprinted on it but no other identifying marks. The metal channel is 9/16" wide X 35" long. What is your replacement? Thanks!
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Good morning! Stamps ending in "9" use an old type of designation that has gone out of style. One of the existing stamps for the S350-35 may work, but you will need to weigh your sash and refer to the chart shown on that store page to confirm the proper match.
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