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S351-36 36" Series 351 Channel Balance

The measurement from metal end to metal end is 36" Although the stamp shows 35

need two and was wondering what part number I need.

36 inch metal part Sorry email was wrong on previous email

I've determined I have the Series 351, 36". However, the stamp option is 3590 which is a stronger spring than appears on the chart.

I need two 36" marked with number 3530 I will try to enclude pics I can not install but your videos explain well hopefully I will be able to find someone who can. Also I can not find markings for who made these old windows and I'm interested in new screens any idea where I go for those Thank y ... (cont.)

each piece is 36 inches long 3540 is engraved on end as seen in photo

We're trying to match a balance that has 3564 stamped on it. I can find 3560, will this part be adequate for replacement of the existing? It is for a non tilt window and a 1/2" balance. Your help is appreciated.

Window channel sash balance question: Can you tell me what is the length of travel of a window channel sash balance compared to the length of the balance itself? In other words, a S351-36 channel sash balance is 36" long - what is the maximum recommended length of travel for the sash using this bala ... (cont.)

I need to order 12 window channels. I believe it's the 36" Series 390 Channel Balance with 19-002 top and 15-001 but I would like your advice. I've attached photographs, also the metal part is 36" long and is marked "35DS".