Finestra 1938 operator issue

A quick learner from USA says:

I'm trying to close this window. (See attached pictures). There are two issues: the crank shaft which should have splines is worn flat. There's nothing to grip on to In order to turn the crank shaft. In addition, the operator was likely damaged by burglars who pried the window open from outside. I managed to get the window open in order to strip the paint off. But now it will not close. I would like to dissemble the operator to see if I can close the window by freeing up the gear on the operating arm. Looking directly at the crank shaft end, there appears to be a clip with two shallow indentations 180 degrees apart, surrounding the crank shaft. I've unscrewed the three top screws but the unit doesn't want to come apart.

Any ideas? I don't want to saw the arm off but will if thats what it takes to secure our house.

Thank you,
User submitted image of their window hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
We do carry Fenestra operators with 9" arms, but they're a somewhat different style compared to yours. See our 39-344 and 39-358 and let me know what you think. These operators have both mounting holes for installing on the sill, or mounting holes that go into the lower rail of the window itself. You most likely have a window track like the 39-504 in which the end bearing of the operator arm rides. If you operator will not slide out of the track, it could be damaged. You should be able to unscrew your existing track if you need to.
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