There’s the hand cut way which is fun to do but this just gets it done quickly and accurately with a power assist. It’s nice to have two routers to cut the slot but it’s a bit of a luxury. If you only have one router, you can remove a lot of the waste using a circular saw and chisel before you route out the channel using the dovetail bit set at final depth. Do not unplunge the bit until you are done routing the slots to ensure a flat bottom and consistent socket. The router sled is my own adjustable version after seeing Timothy Rousseau’s. The L-fence is built using Bob Van Dyke’s design. The routers used are the Festool OF1400 and the Dewalt DW621 and my goodness is it an amazing router at half the cost of the Festool. It has better dust extraction too. The bit used is made by Whiteside. Some Lie Nielsen tools come in to fine tune the joint.