casement operator and track made by Sears

Hi Charles. I'm not sure about a possible replacement for this old casement operator, but I'm forwarding this discussion to one of my senior colleagues who specializes in this type of hardware, and we'll get back to you as soon as we can. 

Thanks for your patience with us, Charles. Have a look at our 39-020 wood window crank, as well as, the 39-520 track. These may be the two parts you need for your replacement. I am also going to place a guide below on the installation of these parts. I feel they may be useful. Look it over and let us know what you think. 

Guide: How to install a wood casement window crank