Alcon Window Spring 2910

A home owner from Apollo Beach, FL says:
The Balance spring is from an Alcon window. It has a part number 2910. The metal channel is 1/2 inch wide by 30 inches long. Overall length with end pieces is 31 inches. Looks like you photo of S380 or S385. I need 6 of them for 3 widows with the end pieces installed.
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Bob from SWISCO responded:

See our S380-30 or S385-30. The only difference between these two balances is the bottom nylon shoe depth, as shown in the picture below. The Series 380 has a shoe that is 1" deep; the Series 385, meanwhile, has a shoe that is 1-3/32" deep. Compare both with your old hardware to see what matches best. If your balance's shoe is in fact less than 1", let me know. 

In any case, you'll need a stamp option of 2910. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A home owner from Apollo Beach, FL says:
Thanks for your help. My bottom piece is less than 1 inch wide. Mine seems to be only 7/8 inch wide.
Jim
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Casey from SWISCO responded:

We do carry a bottom attachment with a 7/8" depth, our 15-029. I would recommend checking another balance as well since these attachments can wear down a bit over time. If you're confident that you need the smaller 7/8" attachment, we can have them custom made for you since we do not carry a stock balance with this attachment. 

Dimensions for 15-029
Dimensions for 15-029
A home owner from Apollo Beach, FL says:
It looks like I really need the 7/8 inch. I checked 2 windows out of the 3 windows and they have the 7/8 inch bottom pieces. I have 2 questions. What is the cost of the proper custom version? Could I just purchase the standard series 380 and use my belt sander to remove 1/8 inch of material?
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Casey from SWISCO responded:

Custom balances would be $11.80 each. Let us know if you'd like to go the custom route and we can get an order link together for you.

That being said, you could use the S380-30 balances and shave down the bottom attachment a bit. Just keep in mind that once the balances are altered, they can't be returned for a refund. 

A home owner from Apollo Beach, FL says:
I would like to go the custom route. I will need 6 of them and 6 of the "5/8 inch sash guides "Norandex" product number 18-161.
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Casey from SWISCO responded:

Great. We just sent over an order link in a separate email. Take a look and let us know if you need anything else. 

A home owner from Apollo Beach, FL says:
Thanks for all the help. I just sent in an order.
Jim
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