Part for window

A home owner from Swarthmore PA says:
Caradco window identifying marks are entry guard truth # 20755. The only part I need is the white circular part on the end of the arm. It has worn away due to use I assume. I'd rather not want to purchase the whole arm if possible. Thanks so much.
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Tom from SWISCO responded:

Unfortunately, that white nylon bearing is not sold separately. If that breaks, you need an all new operator. 

Yours in particular looks like a match for our 39-031. I recommend reviewing our dimensions to make sure they all line up.

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