Using a table mounted router, table fence and 14 degree dovetail bit we cut a dovetail slot in the center of the legs. Mark the center on your stock as shown below. You will need to mark the stop location on your fence to be sure that all dovetail slots are the same length.
Cut matching dovetail pins on the end pieces of the stool. Be sure the pin length is an exact match to the slot depth, this must be a snug fit. When assembled these dovetail slots and pins tie the two leg frames together to form the stool.