Pinion loose bearing

[Kmoody]

Sorry if this has came up else where. I have looked! I have read all the paperwork and listened to all the utube videos. None that I have found really show how to handle when the inner pinion bearings spin on the shaft. I hope I am explaining this correctly. The bearings don't have to spin and yet the bearing will spin on the shaft. Metal on metal. Only thing I have heard is u have to Knurl the metal but how and what type person does it on this type of part?

Thank u