Window cranks

I'm afraid it's not possible to identify what kind of cranks you have based on these images. Too much of the mechanism is obscured.

We may still be able to help, but this service requires clear, unobstructed photos of each part you want to replace. In your case that means full removal prior to taking your photos. Based on the setup of your window, there's good odds you need to pry up the wood sill trim before you can do that, but you'll have to check to be sure.