Are you talking about X or Y ways? If you're talking about Y, mic you ways at both ends and in the middle. If you have more than .0015 or .0020 inch on Y way it will be hard to repair without sending it in to a rebuilder. The y ways don't come off. I have replaced the saddle with repaired factory saddles and once I had a customer send a saddle to a company called Danaher in Tulsa, OK He has had good luck with his repair.