Series 351 Channel Balance Stamp 2190 23 BSI TM

A quick learner from Chicago, IL says:
July 10, 2018
I believe I've narrowed down the replacement channel balance that I need to the Series 351 - 22 inch (metal length, not including plastic hardware extending from the ends of the metal).

My stamp says 2190 23 BSI TM (see attached pictures) and I only see stamps up to 2175 available in the catalog. What do you suggest I select? I have one window that I would like to replace the pair of channel balances on, but a couple windows are getting difficult to open and close so I may replace them as well.

Thank you,
Sean
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Tom from SWISCO responded:
July 12, 2018

Hi, Sean. Weigh your window sash and compare to the chart on the S351-22 webpage. 2190 was an old stamp used on heavier windows, but it's not necessarily stronger than the modern 2175. The two systems don't line up. You need to weigh the sash to figure things out in terms of the new system.
22" Series 351 Channel Balance
22" Series 351 Channel Balance
S351-22
$9.91
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