Cherryville Chuck· Retired Moderator
I looked here (https://www.ereplacementparts.com/craftsman-31517370-router-parts-c-158286_170726_170863.html) for the part but nothing looked like it and no diagram. I'm not sure what it does. There are very few critical parts for old Sears routers. The 315. means it was made by Ryobi but that probably won't help.