Window Channel Balance

A handy person from Montreal says:
November 2, 2012
Hi,

I have two sets of window channel balances to fix. I would like your help verifying that I'm buying the correct replacements. One set has the indication "25C" on the side, and the other has "16A". Both are non-tilting and have 1/2" channel width. The actual channel length appears to be 26" and 17" respectively. My best guess at the series is #390. From the attached photos, is this the correct part?
I'm not sure what weight range each sash falls within and there is nothing else stamped. How do I determine the weight range?

Thanks,
Ronnie
A customer submitted photo of channel balance attachments.
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Tom from SWISCO responded:
November 2, 2012
Thanks for posting. Before I can confirm what Series channel balance you have, I'll have to figure out what your bottom shoe is. Please look at the measurements for our 15-001 and 15-002 bottom shoes and note their depths. As you can see, they are 1-1/8" deep and 1" deep, respectively. Which measurement more closely resembles your own shoe?
A handy person from Montreal says:
November 6, 2012
Hi,

The bottom shoe appears to be 1-1/8", therefore it must be the 15-001. Do the stamps provided help determine the sash weight range?

Thanks
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Tom from SWISCO responded:
November 6, 2012
Thanks for getting back to us. In that case, I agree with you that our Series 390 appears to be the closest match. Please see our S390-17 and S390-26. For the 17" balance, take a look at the 1610 option. This can carry a window sash weight range of 5 through 8 pounds. For the 26" balance, consider our 2530 option. This can carry 15 through 19 pounds. Weigh both of your sashes and compare them to these ranges to see if these options would work.
A handy person from Montreal says:
November 7, 2012
The sash to go with the 17" balance is on the bottom of the window and weighs approximately 6 pounds - the 1610 option seems appropriate.

However the sash for the 26" balance weighs about 10 lbs and is on the top of the window. Is the 2530 still suggested, or would the 2520 be better? If the balance is made for a higher weight range, will the window have a tendency to move upwards?

Thanks!
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Tom from SWISCO responded:
November 8, 2012
If that sash weighs 10 pounds, then you should go with the 2520 stamp, yes. Have you ever had any difficulty opening that window in the past? It's odd that it would have the 2530 weight rating for such a light window.
Channel Balance Shoe, 1-1/8" Depth
Channel Balance Shoe, 1-1/8" Depth
15-001
$0.74
Channel Balance Shoe, 1" Depth
Channel Balance Shoe, 1" Depth
15-002
$0.74
26" Series 390 Channel Balance
26" Series 390 Channel Balance
S390-26
$10.55
17" Series 390 Channel Balance
17" Series 390 Channel Balance
S390-17
$9.34
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