I'm looking for a router bit, sort of like like a flush trim bit or a rabbeting bit, which would have an interchangeable bearings to vary the depth of cut. Specifically I need to have bearings larger than the diameter of the bit, so that if the bearing rides on the pattern, the workpiece would be trimmed proud of, rather than flush with, the pattern. For "bonus points", I's like the cutter to be a shear cutter versus a straight cutter, for the cleanest cut.
I know I've seen this bit, but I can't find it on the web. Can anyone point me in the right direction?