kolbe window crank

A home owner from cecil, wisconsin says:
these pictures are of the screw that opens window when you turn handle. I have tried to press bushing into assembly but keeps coming out when turning crank to close window. it appears that bushing is worn on the collar. where can I find this replacement part. thank you.
User submitted a photo of window hardware.
Profile picture of Tom
Tom from SWISCO responded:
I'm afraid this worm gear cannot be replaced. If yours has come out, you need an entirely new operator. I can help you identify a match, but we will need to see the complete operator removed fromt he window.
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