Plastic white roller too thick

A quick learner from Queens nyc says:

I have a casement window which was part truth 40055 right side. The one fits but the white plastic roller that goes under the window piece is too thick and I cannot fit it into it. (The piece that you mention in picture that is 9/16") The old style is a single metal platen and without any rubber and it is really thin. How can I adjust it so it fits or do you have any other surface mount operator that can fit? I am looking for 9.5" arm.
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Dave Sr. from SWISCO responded:
I'm not sure what you have, exactly. Could it be our 39-366 operator with the stainless steel bearing at the end of the arm?
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