need replacement casement window operator

A quick learner from Vermont says:

Entry Guard TRUTH is stamped on the long arm.

20810 is stamped on the shorter arm .

40471 is stamped into the mounting plate.

I am not sure which parts to measure (I don't know the names of specific parts). The problem is that the gear teeth have worn down on the gear that makes contact with the " barrel" part that the handle attaches to. I don't want to take the part out as the window will fall if I do...so will wait to get a replacement part and then have a friend come help. Thanks for any recommendations!

Annie 

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Emily from SWISCO responded:

Hey, Annie.

Thanks so much for your patience during our busy season. Start by taking a look at our 39-031 & 39-032 or the 39-155 & 39-156 operators. Carefully compare our dimensions to yours and see which ones match up to your original assembly. 

A quick learner from Vermont says:
So close and yet, "no cigar"! The short arm of my window operator has an upward offset and the peg/plate it attaches to on the window would need to be replaced in order to retrofit with your 39-031 in order to have the pin in the correct position. Any further suggestions? Do you sell the plates that screw onto the window? See photo.
Again, thank you!
still hopeful,
Annie
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Emily from SWISCO responded:

I'm afraid we don't carry the 39-031 and 39-032 operators with an upward offset. These used to be made with that same offset, but not anymore. The direction of the offset doesn't matter too much in the long run. In cases like yours, you would just kind of have to bend down that short arm to snap on the bracket. See if our 39-509 and 39-510 brackets match up to yours. 

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