When I needed to make several scarf joints for a cover board in a boatbuilding project, I used a router and template to cut the joint’s profile. The challenge was to shape the template so that the inside curve would be identical to the outside curve. Finally, I hit on the idea of using a router bit with the same radius as the joint’s curve and a template bushing with twice the radius. With my router set up this way, all I needed for a template was a simple glued-up block with three straight line edges.

Robert L. Thompson, New Hampton, N.H.

Fine Woodworking Magazine, August 1992 No. 95

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