I did an R-65 last year. Make sure you have a good drill bit and start drilling out rivets. Take the piece of sheet metal out that goes from the fuel tank hump in the grain tank down to the auger trough. I think that was the only thing I didn't do at first, and once it was out of the way it came right out. There is also a return line, I believe that you have a little access door to get at from the back side of the tank on the auger side of the machine. Hope this helps.