.....a scrap piece of 1/4" plywood and a nail. That plastic or phenolic or whatever base on your router is designed to be removable. Take it off, copy the screw hole placement onto the 15 or 20 inch long piece of plywood by wide enough to hold the screws for the base. Use your 2 1/2" hole saw to make the hole for the router bit and attach the plywood (it is now officially called a Trammel) to the router. Draw the circle with a compass. Put the outside edge of the cutting bit on the circle and find the center, mark it on the trammel and push a nail through the trammel and into the center hole. Push, plunge or whatveer the router into the wood, rotate. Or do what I did, as per Wayne's advice, having made too many trammels over the years I got lazy and bought the Jasper.
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