crank handle
The knob rotates around the screw when cranking the handle to open or close the window.
Thanks for your help
Thanks for reaching out! It sounds like you could be talking about the set screw in the handle or the worm gear that interacts with the gears inside the operator. To be able to properly identify the replacement you need, I'll need to see a photo of the existing hardware.
Are you able to provide photos?
Thanks for the photos! Although, I'm sorry to say they do not provide enough information to properly identify the replacements you need. May I see a photo of the entire crank operator?
Thanks for the photo. I'm sorry to say we would not be able to supply you with a replacement for this type of operator. That ribbed piece appears to be the spindle that the crank handle attaches to. If this is damaged, there is a chance you may need to have the entire mechanism replaced.
If you know who the manufacturer is, I would suggest trying to reach out to them or a local retailer who sells their parts to inquire about how you might be able to repair this operator.
Our sincerest apologies that we cannot be of more help with this repair but please don't hesitate to reach out with any other hardware repair questions you might have.