Had to cut out old flanged bushing with dremel tool. Greased outside of bushing and used a rubber mallet to tap it into place. There were no instructions for the bushing or in the parts manual as to how far down to tap the bushing. I just did best I could to align it as to height with the opposite bushing. Test drove the Gravely z1640 and it works fine. I have not ridden it hard or for any length of time, so for now 5 stars.