Replacement cover / crank

Thanks for posting. I believe a crank and handle kit like our 39-107FK could work for you. It's meant to fit operator splines that have a diameter of 11/32" and that are centered. See below. However, please note that the damage to the cover might be indicative of an operator that is wearing down and needs to be replaced. If that is indeed the case, we may be able to help, but we'll have to see pictures of the entire operator including the link arm(s) that push and pull the sash. A bird's eye view of the entire mechanism, with the window open, would suffice.

View of 39-107fk unfolded

The 39-107FK does indeed have a Folding Handle. To ensure it will work with your operator, please send me a picture of the entire mechanism including the link arm(s) that push and pull the window. This is best obtained from a bird's eye perspective, with either the operator removed from the window or the window open. Once I can identify your operator, I can say with greater confidence if the 39-107FK can work for you. 

Thanks! This appears to be a pretty typical EntryGard style operator. I am very confident that our 39-107FK will be compatible with this application.

Yes! Our 39-323 is also fully compatible with this operator style. It's just an alternate version of the 39-107FK, and doesn't include a handle.