This chairmaker’s router will help you cut decorative grooves in chair seats — and it works equally well for cutting grooves in any straight or curved work. The fence adjusts so you can vary the location of the groove, plus it reverses to handle either straight or curved work. You can adjust the U-shaped cutter to change the amount of material it removes, and by simply reversing the cutter you can cut in the opposite direction — no need to adjust the fence.
The chairmaker’s router sells exclusively at Woodjoy Tools, for $95. Supposedly a V-shaped cutter assembly is available, but there’s no place to purchase it on the Woodjoy site. You may have to contact them directly.
Chairmaker’s Router [Woodjoy Tools]