Tom from SWISCO responded:
April 22, 2024
Looks like you need a new top sash guide. It's tough to make out what yours is, exactly, since it's so damaged, but it reminds me of our 18-174. This may be what you want, but carefully review our specs below to confirm that they match. If they differ in any way, please show me an undamaged version and we can do our best to find you a better match. Detail of 18-174
Side view of 18-174
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