Remove the Gravely's spark plug with pliers.
Cut the old starter rope just below the rubber handle.
Remove the starter cover with a nut driver.
Pull the starter assembly out, and use the pliers to release the tension on the recoil spring.
Unwind the old starter rope and remove it. Wind the new starter rope around the new starter assembly, and reset the spring tension with the pliers.
Place the new starter assembly back into the cover and bolt the cover down with the nut driver.
Slip the free end of the new starter rope back through rubber handle and mount it on the handle of the Gravely.