channel ballance

A home owner from miami,FL says:
my old channel ballance has 1/2 in width and 1690 will the 1650 you sell work?
A quick learner from miami,FL says:
can't find a unit with the same top plastic insert,
Thumbnail of the uploaded file named IMG_4013 (1).jpg
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Emily from SWISCO responded:

Hi there! 

It appears your assembly uses the 19-041 top fitting. This isn't used on any stock balance of ours but we can still help via custom order. I'll just need a few more details so that I can get this moving for you. I see you mentioned the number 1690, is this the stamp printed on the balance? If so, we will need you to weigh the window sash on a scale and tell us the precise weight. That will allow us to calibrate the spring strength. Can you also measure the bottom fitting as shown below and tell us what you find? Finally, how many balances are you looking to order? I can draft a price quote from there.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

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