My feeling is that a faster z motor using the Ridgid router’s existing height adjustment mechanism will not be worth the effort. In the grand scheme of things, the stock z axis motor compliments the cutting speed of the Maslow pretty well. Making it faster will do nothing to improve the inherent weaknesses we encounter with the sloppy mechanics of the stock router.
Take a look at the following for a solution that kills many birds with one alternate approach to the z axis…