Anyone know of a circle jig for use with a table router? I make a lot of small "candlestand" tables with tops around 16"dia. and usually rout the edges with a hand held plunge router. I figure there must be a way to do this on my bench model and have an idea for a radial arm across the bench with a centering pin to hold the top while I rotate it past the bit. Does this sound practical and/or has it already been done?