Pella casement window with a failed mechanism

A home owner from Ottawa, ON says:
I have a casement window with a failed mechanism- the piece that's supposed to glide along the bottom of the window frame has detached from the window. I can't seem even to close it by hand (without the crank)- it might be frozen.

I thought it was a Pella window (because other windows in the house are), but now I'm not sure. The frame is made of wood. Can you help me figure out what I need to buy to fix this? I've attached some photos.

Many thanks!
User submitted photos of a window operator.
Profile picture of Donna
Donna from SWISCO responded:
Thanks for posting! I do believe that this is a Pella window. Please see our 39-176 & 39-175 Pella Sash Crank Operators. Compare the dimensions and let us know if they differ in any way.
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