Remove Deck, Remove Blades, Remove guards and belt, use old belt to hold pully to remove pully (would be good to have pully wrench), Remove mandrel Assembly, Install new mandrel assemblies (had to tap the new mandrel assemblies. Should have been done by manufacturer.). Reinstall blades, guards, and belt. Put deck back on.
Mark the location of the spring so you know how it goes on. Snip off the push nut holding the deflector shield pin. Hammer the pin out. Insert the pin with the spring holding the new deflector shield. Use a socket to steady the push nut and hammer the pin into the push net until secure.