I am cutting a 1/4 inch groove on the back of a serpentine drawer to receive the bottom. I used a router plane on the convex part and was able to cut a 1/4 inch deep groove on 75% of it. The concave center did not allow the flat soled router to work so I scored some lines with a marking gauge and finished the groove with a 1/4 inch chisel. Looking into a tool that might do the whole job, I noted the LN beading tool ( stanley 66 ) has a 1/4 inch router attachment - how convenient - alas, it has a flat sole so the concave area would give it problems. Lee Valley has a rounded sole beading tool which may handle the concavity but no routing attachment. I know the scraper irons would probably work, but the idea of a routing iron on a rounded beading tool is interesting. Thoughts?;