balance question

A home owner from Medford, Ma says:
Hi, My old balance is 23" long (S751-23) and is stamped with the number 22 only. What would be the correct replacement one?
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Donna from SWISCO responded:
It is good that you identified the balance series and measured the length, the stamp option refers to the strength of the balance. Please remove the window sash and place it on a scale.
Stamp options for 23" Series 751:
22R will carry a window sash weight range of 10 through 18 pounds
22HD will carry a window sash weight range of 18 through 22 pounds
22TG will carry a window sash weight range of 22 through 30 pounds

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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