My oakie bushing was taken down a little to fit the first attempt on the older tube I used a file and filed it evenly around until I was confident it would fit then sanded with sandpaper smooth .I then left the oakie in the garage as it was cold winter so the oakie was colder than the freezer and used a heat gun to heat the tube .The oakie went in all the way but I found out that the yoke would not go in and also the driveshaft was difficult to turn.I think the driveshaft were the bushing was pushed back was gummed up making the driveshaft stiff to rotate the yoke did not fit because of the hammering and from fitting tight in the tube .I learned that maybe if I used brake clean to spray in the tube around the bushing that is left inside would have cleaned the other side so it is not so gummed up and will help the bushing slide forward when putting the oakie in and the yoke can be tested to see how well it fits before putting the oakie in and if it is tight after you can wrap a piece of emery cloth around a thin pipe that will fit over the spline of the driveshaft to sand it .
