Replacement Casement?

A quick learner from Taos, NN says:
Hello,

I am having trouble finding a suitable window operator replacement for the attached photos. The window operator arm often falls out of the track when opening and closing the window all the way. How should I fix this? Will replacing the window operator arm resolve the issue? If so, which replacement part is suitable?
Thank you for your help!
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Casey from SWISCO responded:

Hello,

I would recommend detaching your operator arm from the track to compare to the specifications of the replacement options that we've related for you. 

As for what is causing the problem, I can't be sure but you can start by checking the track for damage. If the wheel at the end of the operator's arm is broken, that would also account for why the arm isn't staying in the track. It's also possible that the track could be installed in the wrong position and you may need to move it to a new position so that the operator doesn't slide out of the end of the track when the window is being closed. Take a look and see what you think. 

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