The 39-286 does not fit on my operator

A home owner from Massachusetts says:
I purchaded item 39-286 and it doesnt fit. Any suggestions on wgat size to try now? See attached photos.the numbers on the handle say 60-c-704-62 and small #2 in the corner.thank you.
User submitted photos of a window operator.
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Paul from SWISCO responded:
It's hard to say without more information. The 39-286 is meant for a 3/8" bore. What size is yours?
A quick learner says:
its 3/8" by my measures ..when i put it on,the end goes too far down and wont screw on
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Tom from SWISCO responded:
It's possible your old bore has worn down over the years. Try using a piece of scotch tape or adhesive, that may help keep the handle on. Otherwise, it may be time for a new operator.
A quick learner says:
Ok. Thank you so much
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