SWISCO - The Replacement Hardware Authority

i need window balances for several milgard vinyl windows, 10 years old

A quick learner from claremont ca says:
the attached image show the stamp on the existing balances - which SWISCO part is a replacement?
User submitted a photo of a window balance.
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Tom from SWISCO responded:
I'm afraid I cannot determine what Series you have based on just the stamp. I will also need to see the top and bottom nylon attachments. Also, can you confirm the weight of your sash? Looking at the stamp, I would assume it's 39 pounds, but I would like you to confirm just in case. Thanks!
A quick learner from claremont ca says:
it looks like series 380 or 385, based on the end attachments. the sash does appear to be about 40 pounds
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Tom from SWISCO responded:
Great! Both those Series have stamps that can carry that weight, so all you need to do is confirm which you have.
A quick learner from Claremont says:
Ok, how do I do that? The pictures look the same to me.
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Tom from SWISCO responded:
The key difference between the Series is the size of the bottom shoe. You need to measure your own, then compare your measurements to ours to determine which is a better match. We have detailed measurements on each product's store page.
A quick learner from claremont ca says:
OK, the shoe is 15-004, so it's series 385.

How do you measure the length of the balance - just the metal part, or from plastic tip to plastic tip?

And do I have a problem if the actual weight of the sash is 39 pounds when the weight range maxes out at 34? It's a Milgard window, but there's leaded glass sandwiched inside the double panes. I'm guessing that's where the high weight comes from.
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Tom from SWISCO responded:
You only measure the metal channel. Based on your stamp, I would guess it's 33".

The S385-33 has two stamp options that can cover 39 pounds. I recommend weighing yours on a scale to get a more exact weight so that you can determine which is better: the 3265 (35 to 39 lb) or 3270 (39 to 42 lb).
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