Pella Casement window operator measurements

Question

At a loss for solutions but willing to adapt an operator to replace ours, which is a 1967-1993 model, a Left (window opens left to right) operator.

Wondering what the measurements for a 39-391 operator might be. The arm from the center of the pivot for the gears to the center of the rivet at the end of the arm, and the length of the link from the end of the arm to the center of the rivet at the window mount.

I may have to cut and adapt to my windows but our gears are stripped to where the window won't close to a gap of more then three inches.

Tom · Accepted Answer

You can see the dimensions for the 39-391 on its store page. I will also post them here for your convenience. I should mention, however, that this is a very singular type of operator and is not meant to be used as a substitute for other styles. Pella products are very, very specific and in almost all cases you need an identical match. I might be better able to help you if you can show me a photo of what you have now.

Dimensions for 39-391