I made a chair rail out of pine using a router bit, only to discover that it was too wide for my daughter. Since I'm going to be a grandpa, I best fix it now. I was in some old homes and noticed the shape of those railings were exactly the fix that I need. The problem is how to go about it. See attachment, which outlines the existing and the proposed. I don't want to cut corners on the table saw - then use spokeshaver etc. it's about 13 feet long. Any suggestions?
Ron