casement window handle

Thanks for posting. If I understand correctly, it sounds like your crank handles are not secured to the casement window operators. If this is the case, it might be because the worm gear the handles attached to is stripped; if that's the case, the operators are broken down and need to be replaced. We can help you find the right replacements, but we need to see the operators out of the window, with the link arm(s) in full view. From there, we'll try and narrow down what you need. Many thanks.

Hi there! We don't sell the knob by itself, but if all you needed is the handle then see our 39-114L. We also have a folding version if you preferred; see our 39-205.

I'm not sure if you needed the operator and hinge as well, but you show them in your second photo so I thought I'd pull up a few matches. See our 36-048 for the hinge as well as our 39-027E and 39-028E for the operator. Let me know what you think!

Yep, it should be fine. They no longer make "squared" bases like your original. Now they only make what they call "elliptical" bases, but they work the same way. The only issue may be that if you're still keeping the older operators on some of your window then they won't match the new hardware.