Channel Balance Code

A handy person from London, ON Canada says:
I am looking at the 351 channel balance for replacement of my old ones only based on appearance of the shoes. The code on my 23" channel balance is 22-D which doesn't seem to match any of your numbers. Any suggestions would be much appreciated. Thanks..........Henry
User submitted photos of a window balance.
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Tom from SWISCO responded:
A stamp of 22-D usually corresponds to our 2240 option, but you can always weigh your sash to confirm that this is correct. We have a chart on the S351-23 store page that shows how much weight each option can support.
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