I am making an oak counter and will be installing a cooktop flush. The corners of the cooktop have a 3/8" radius. The rabbet needs to be 1/2" wide to support the lip of the cooktop. To get a rabbet that wide, the bit i'm using has a diameter of 1 3/8" 1/2" is the largest the bit is capable of. That said, the corner will not produce a 3/8" radius to match the cooktop. I'm glueing up the counter with the proper sized cutout prior to routing the rabbet. How can i get that 3/8" corner? just free hand it after i rout the bulk of the rabbet?