Forgot to include the speedi sleeve. The last one I did, some master mecanix used a hammer on the seal surface. Speedi sleeve is the answer and it is stainless too. I put a thin coat of sealant in between the sleeve and yoke and on the washer and nut to prevent leakage down the splines. The seal no. should be on the seal, clean and read. There are so many different sizes of yokes that you need to get the one for your machine. Also, there is no guarantee that yours is the case that came from the factory. Some of the seal OD's are different for the same size machines. Welcome to wrench turning.