Replactment operator for casement windows

A handy person from Hollis, New Hampshire says:
June 17, 2017
The holes on the operator are 5" on center and the outer part of the arm is 4 1/2" (see photos)
User submitted a photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
June 20, 2017
Take a look at our 39-188, this looks like it could be a good match. The link arm is 5", rather than 4-1/2", but it may still work. If you install it and find the window does not open and close properly, you can swap the link arms out. You would drill them off the old and new operators, then install the only link arm on the new operator using a 62-014 rivet.
Sash Dyad Crank, 5"
Sash Dyad Crank, 5"
39-188
$37.10
Rivet
Rivet
62-014
$1.12
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