Andersen casement handles

A handy person from Wilmington, DE says:
Looking for replacement handles for Andersen casement windows installed between 1972-1975. Splines are worn out of existing. Bore is 3/8. Looks like your #39-286, but slightly longer. Inside handle are the numbers
50-C-704 with "62" underneath. Your #39-286 also does not have set screw,
which we need due to worn splines on the operator..

Appreciate your help.

User submitted photos of a window operator.
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Tom from SWISCO responded:
Your operator is very old, so an exact match for the handle may not be available. That said, the 39-286 does have a set screw. You can even see it in the picture below. Could you get it to work?
View of the gear hole with measurements
A handy person from Wilmington, DE says:
Tom, cannot locate #38-286 on your website, not even through "search". Is there a way you can send me specs?
My handle's set screw is approximately 3/16" from center of setscrew to end of handle where the bottom of handle contacts the operator. Replacment needs to be the same in order to contact the operator below the splines.
Profile picture of Tom
Tom from SWISCO responded:
I'm sorry, I had made a typo. I meant the 39-286, which you had previously referenced. If the set screw that comes with it is not enough to work with your current operators, then you will need to replace the operator itself. Like I mentioned, your hardware is very old and there isn't likely to be an exact match.
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