27 6 ER CALDWELL Channel Balances

A home owner from Arizona says:
I need to replace a pair of channel balances for an aluminum non-tilt single-hung window. The metal length is 28". The code stamped on the current balance is: "27 6 ER CALDWELL"

From what I can tell, it appears to most closely match the Series 351 or Series 390 on your website. The bottom shoe measures 1 1/16" across the bottom. I don't see one that exactly matches that. The 15-001 and 15-002 are just a little too wide or a little too narrow. Would you please take a look and help me determine what I need.

Please let me know what you think I need and the the cost for two replacement units.

Photos of the customer's 27 6 ER Caldwell channel balance
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Donna from SWISCO responded:
Series is 390. Please remove the window sash and place it on a scale.
We need the weight of the window sash in pounds to determine the proper stamp option.
A home owner from Arizona says:
The sash these channel balances will support weighs approximately 23 lbs.
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Mike from SWISCO responded:
Please look at our series 390, option 2740 balances. The 2740 will support a sash weight of 23 lbs. Keep in mind, however, that this information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
A quick learner says:
Thank you for your help. I have placed an order. We'll see how balances you recommended work. If they work well, I need additional balances for a different size (weight) window and will contact you again for your assistance in determining the proper balances for that window...
A home owner from Arizona says:
The balances arrived today. They fit perfectly and work like a champ. I'll be in touch again when the need arises to order more. Thanks much!
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