Replacement tubular spiral balances

A home owner from Beach City Tx says:
Hello, I need to replace the balances on several windows. Unfortunatly I do not know the manufacturer. They are aluminum, insulated glass and best I can tell weigh about 20 lbs. The balance tubes are 29" long, 3/8" diameter and the spiral extends out an additional 2.5". The clip appears to be the same as shown on the page for "29" Series 306 Spiral Balance". There is no identifiable tip color, or tip for that matter. The picture on the customer question regarding "help identifying spiral balance for champion window" with the 2.5" spiral extension looks identical to mine except for the clip. James
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Tom from SWISCO responded:
Hello, James. If you have the S306-29, then I recommend our Red Tip for your 20 pound sash. That should cover you.
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