Stamp question

A quick learner from Bradenton says:
I took out the balance rod and finally figured out which top and shoe to use. Measured it at 29" and took the window out and my bathroom scale (which usually lies to me for the record) says its 19 lbs. So Stamp should be 2830 right? The current rod says "28C USB." Which doesn't match with the naming you all list here. So I wanted to clear that up.

None of the windows in my house stay open. All of the rods are broken, on most of them the springs have broken loose or the actual rod housing has bent.

Anyhow, my neighbors and I are needing to get fix a bunch of windows and I want to make sure I find the right things before we order. Any help would be appreciated.

- Trevor
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Paul from SWISCO responded:
Yes, if your sash weighs 19 pounds then the 2830 is the best route to go. Coincidentally, a stamp of 28C often corresponds to our 2830 option, so you have a double confirmation.
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