[Cherryville Chuck]

I would build a sled that angles downward towards the edge and spins on the center of the circle. The router would sit on the sled and you would go up or down and then rotate the jig and keep doing it again until you have gone all the way around. I would stop the slope short of center if it was me and sand the edge of the transition round with maybe a little hand planning first.

 

[Cherryville Chuck]

There have been a few user comments on their bits and one tool review from a pro. All have been good as best I recall. I bought 3 that were architectural bits that I haven't had a chance to use yet but they look very good. The carbide is thick and soldered on to the body well, they are well sharpened, and even the paint job is well applied.