replacing channel balances and top sash guides

A home owner from Florida says:
I do need a set of channel balances--my failed one measures 1/2" across by 29" in length, and are stamped "28 3 Caldwell EM". Does that mean a 29" Series 351 Channel Balance (Product Code: S351-29), #2840 is the correct sash weight range?

Or, if it is 28#, should I go with the 2850? Or, would that spring be too strong and 'zip' up the window too quickly?

Also, I need a number of 18-166 5/8" Kinco Top Sash guides: a number of my windows are failing at once--is it because of their useful life (our home is 21 years old with original windows), or is it the sun/lack of lubrication?

What can I do if it is a maintenance issue to reduce the chances more of the top sash guides break?
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Tom from SWISCO responded:
Thank you for contacting us. I can't say if our Series 351 is the correct choice without knowing what nylon attachments you have on your existing balance. How do they match up to the Series 351? Are they the same size?

As for the option, usually a stamp of 28 3 corresponds to our 2830. You should weigh your window sash and see how that compares to the 2830 option just to make sure it's the same, though. You should not choose an option that is either stronger or weaker than what your sash requires.

As for your top sash guides, I think it's just a matter of their age. 21 years is a long time.
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