Milgard fiberglass windows crank handle replacement needed

Thanks for posting. This is most likely a 39-205 Folding Handle, which fits onto a 11/32" diameter operator spline. It is held onto the operator using a set screw. Please review and let us know what you think. 

Good catch, that's definitely not what I was expecting. That hex design is not compatible with the 39-205. The 39-224 fits onto a 5/16"  hex gear bore. If that's the size of the hex gear on your mechanism, then this is the right choice. If in doubt, send me a picture of the entire operator, including the link arm(s) that push and pull the window sash. A bird's eye perspective, but with the window open, would suffice. Identifying the operator would confirm if the 39-224 is correct. Let me know if you have further questions.