Help! I need to replace a sheared off bolt at the end of the lift arm on my Bobcat S175. The bolt screws into a tapered pin, which secures the Bob-tach, and allows the Bob-tach to pivot at the end of the lift arm. The bolt is 4.5"L x .625" dia. Looks like the Zerk (grease) fitting needs to be removed so that the pin can be tapped back into cylinder on Bob-tach? Any advice on removal & installation would be great!