Casement window arms

Hello and thanks for contacting SWISCO. Are you looking to replace specific parts? If so, could you provide a picture of your operator in its entirety, including the arms? This will help us narrow down what you're looking for.

To answer your question: it varies a lot by the manufacturer. Each manufacture has different ways of differentiating between right and left hand orientations for their casement window operators and arms. If you are ever in doubt, just ask us and we'll see if we can identify what you need.

Okay, thanks for clarifying! Yes, your assumption was correct. If the mechanism that connects the crank handle to the operator is missing, then these cannot be individually replaced, and the best thing to do is to replace the entire operator. The most reliable way to help you do this is to take pictures of the entire operator removed from the window, including the arms. This will help us identify what you might need. If you need help removing the window operator, take a look at the video below.

Again, I'm afraid it is very difficult to say for sure what you need without seeing a picture of the entire operator(s). You can take a look at the 39-147 and 39-146 for the Andersen 4-1/2" Window Cranks (Left and Right-Handed versions). But be sure to closely compare your dimensions on the product page with the dimensions of your old operators. We find ultimately this is the most surefire way to know a replacement is a good match, as old manufacturer codes can be misleading or match a number of possible parts. 

Thanks for the pictures. This indeed looks like our 39-147 and 39-146 Andersen Window Cranks. Double check with your old parts to be sure.