How to remove and replace operating unit in a wood casing

A quick learner from So. Calif says:
I have a unit with the operating handle broken off. How do I remove and replace without damaging the wood casement. The inside of the unit has the cover plate at the handle that looks to be one piece and not removable. The outside operating arms seem to be permanently attached to each other. If I cut the arms off the old unit, remove the two mount screws and remove it from the inside - how do I get the new one in place? I have 5 of these windows. One photo shows the broken unit, one shows a good unit and my casement for all windows. Thanks for any insights!
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Tom from SWISCO responded:

You'll likely have to remove the sill trim that's covering the operator screws.  Check out the video below, where we show how to do this with a different kind of window. The method should more or less be the same. Let me know if this helps.

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