I want to route a half round edge on a 1/2" thick board with corners that have a 1" radius. I can use a 1/4" roundover router bit on both the top and bottom sides of the straight edges of the board using a fence on my router table. I can also route one side of the radiused corner of the board using the bit alone with the bearing running on the unrouted edge, but when the board is turned over to route the other side of the curved corner there is no unrouted edge for the bearing to run on and a fence does no good. HELP PLEASE. How do I do it?