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S152-6 6 lb Series 152 Coil Balance

I need help with this one. I've searched the website but have had no luck finding one that is similar. This is a coil balance pivot shoe.

Is the S190-640 a 6 lb spring? Also, how long is it? I have several coil balance springs that need replaced on double hung windows 32 x 62h and want to be sure these springs are long enough. The tallest window is 32" x 66h which I calculate will take two 640's on each side. The detents seem OK o ... (cont.)

Looking to replace this double coil balance. The width is 1/2". The inner coil is stamped "5" and the outer is stamper "6".

Hi, I'm trying to match these coil balances for a 20 to 25 year old window that weighs 12+ lbs. The number 6 is stamped on the coil but no other letters are visible. The coil is 1/2" wide, the pocket is 9/16" deep and around 1-1/2" wide. The coil has a hook on both ends which doesn't match your ava ... (cont.)

Hi there! Do you know where I can find coils for this? I haven't been able to find them anywhere. Both have snapped in my window. My shoe is nearly identical aside from a hole for where the window goes in. Thanks for your help!

The constant-force coil spring that we are looking to replace has an "E" stamped on it, not a weight #. Do you know from that designation what size spring we need?