Gordie,
Have you called Clausing yet to see whether or not they still have some? 800-323-0972. I haven't asked for parts for any of the older Clausing machines but parts availability is fairly good on the Atlas lathes and less so on the mills and shapers. If you can find the part number first, that may increase your chances of getting either the part or a drawing from which to make it. If they do still have it, be prepared for the price to be a today's price, not what it would have been last century. If they don't have it, ask whether they have the drawing and if so, get them to email you a PDF. And if you'll send me the PDF, I'll clean it up and put it into Downloads.