I have an older craftsman router mod. #315.17480. I am trying to use a rockler dovetailing jig system and the bits are 1/2 in. 11mm It comes with a 1/2/ 11mm adapter but that does not fit the nut. Does craftsman have an adapter that will work for this job without costing a fortune, or a replacement collet and nut that will fit this older router? If so where can I get them quickly.