Precisely place routers in insert plates
Here's a quick way to precisely center a router in a router-table insert plate. After cutting the insert to the proper size, mark diagonals to locate the center and drill a 1⁄2 " hole there. With a 1⁄2 " O.D. guide bushing mounted in your router's subbase—without the router attached—fit the bushing into the hole on the bottom of the insert and orient the subbase to ensure that the router controls are in reach and any through-the-table heightadjustment holes are toward the front. Mark the locations of the screw holes, drill and countersink to fit the subbase screws, and use a 11⁄2 " Forstner bit to enlarge the center hole. Then, mount the router to the insert plate and you're ready to rout.
—from the WOOD® shop