Caldwell channel spring?

Handy Person from Sarasota Fl.
Trying to identify the part, also I tried reinstalling but I can't get the window to fit with both springs reinstalled. Aluminum single hung windows probably from the late 80s early 90s. thanks
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. Is the metal channel, not including the end attachments, 30" long? If so, this might be an S377-30 Channel Balance, with a stamp option of 2910 (your old balance's stamp reads 29-1, which would accord with the 2910 option). However, please compare your old balance's fittings to the 19-018 Top and 15-005 1" deep bottom. See their dimensions below, and let us know if anything seems different. As for removing and re-inserting the sash, it is certainly a tight fit, but assuming the balances and top sash guides are in working order, it's simply a matter of taking your time to fit in. See if the video below helps, or if you have further questions or concerns.

Alternate view of 19-018
Alternate view of 19-018
Alternate view of 15-005
Alternate view of 15-005

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