window block and tackle

A quick learner from Colorado Springs says:
sash weight range question - nothing stamped on my existing except 26 4 GT CMC 4
My existing double pane windows are set in vinyl and are just 30in x 23in
I am unsure what weighted sash to stipulate in my order and do not have the ability of placing a window on a scale at this time.
FYI - I do have the rolled edge on my existing channel. Is this an issue or option with you?
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Tom from SWISCO responded:
If you have a stamp of "26 4," I recommend our 2640 option. However, it's always a good idea to weigh your sash just to confirm that this is correct.

Our balances do not have rolled edges but that doesn't really matter. It's just a slight design difference between manufacturers and doesn't affect the function of the hardware.
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