replacement parts for milestone single hung series 1000

A home owner from Florida says:
My house, built in 2004, has milestone single hung series 1000 windows. The windows are difficult to slide up and down and with several of them if I open them I cannot get them all the way closed. It appears I need to replace the channel balances. After reading one post, it looks like I can use your S380-29 channel balance, but I am not sure of the stamp option. I am afraid to take the current channel balance out, for fear I will not be able to get it back in place while waiting on replacement parts. Is there any way to estimate the stamp option based on window dimensions?
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Tom from SWISCO responded:
There are only two ways to determine what stamp option you need for your balance: you can either match it up to the stamp currently printed on your balance, or you can weigh your window sash on a scale and cross reference the weight with the chart found on our S380-29 store page.

For help on replacing balances and removing the sash, please see the video below.
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