Fixing Operator Arm on 24" Octagonal Window

A handy person from Boston, MA says:
I have a 24" Octagonal vinyl window where the plastic washer piece attached to the operator arm has broken off (the washer is the piece that rides in the metal channel which is attached to right side of the window).

Can't seem to find a replacement washer locally. I managed to glue/fix the plastic washer on two previous occasions, but this time it has broken off and the piece went careening off the roof.

Thoughts on how to fix? Or how do I figure out the exact part to order a new operator arm mechanism?

The opening for the washer to slide over the metal post of the arm is: 5/16" wide. The width of the whole metal post is 1/4" and the section that is the piece that slides in the metal track (which is attached to the window). The washer (or the broken off piece) was 1/16" thick which is the thickness of the track and the track has a 9/16" width.

Am Attaching some photos, but don't have the missing piece to send.

Thanks for your assistance.
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Unfortunately, the disc on the end of the operator arm is not available separately. If yours is broken, you will have to replace your entire operator.

I'd be happy to help you find a replacement, but I'd have to see your whole operator unit. If you can, please remove it from the window and take a few pictures of it separately for me to view. Thanks!
A quick learner from Boston, MA says:

Attached is an overview photo of the hardware which I think should be helpful. Please let me know if you really need me to dismantle the entire crank arm or whether the attached photo will suffice. You are welcome to e-mail me directly.

Thank you.

User submitted a photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for getting back to us, Sharon. Please see our 39-020 & 39-021 Wood Window Cranks and let me know if you could use these as replacements.
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