Here's the jistof my question. A 17hp. kaw. on my 48" Great Dane w/b. That has more than enough power to run doubles on my mower right? And... how do the double blades go on, do you just put the bolt through two blades at 90 degree angles or how? Thing is my Gravely Pro 40 w/ 12.5hp kaw. has motor problems, so we are swaping the 48" motor (14hp. kaw.) w/ a 17hp. or 15hp kaw. and putting the 14 onto the Gravely. How do the two blades go together?