Are you talking about "C" designations for bearings? Bearings come in a (tight)c2 - c5(loose) clearance designation. Anytime you have motors with more heat or extreme enviroments involved you want more clearance. All electric motors running continous duty usually have C3 bearings which are looser . Bearings found at napa are normal clearance "CN" , you have to specialy ask for any bearing other than "CN" designated bearings, from places like BC bearing, Kamen Industrial, NTN. Its amazing how we find out this stuff, I only found out about different bearing clearances about 2 years ago, our one machine kept eating Napa bearings up every 4 months and I was tired of spending 3 hours rebuilding it for the 5th time, when the first set of bearings lasted almost 10 years. I phoned the bearing company about the lack of quality in bearings cause I was fed up, only to be told that I was buying the wrong bearing.. I need bearings with more clearance for electric motors, and I went HUH! never even new they made bearings with more or less clearance depending on application.
But your play is amazing though, a normal clearance bearing is a tighter bearing, so there should not be a huge amount of play. Is it the bearing that is actually causing the play, or stub shaft fit in the bearing? Did you put in the spacer on the back side of stub (closest to cv)with the taper the right way? One side has a taper one side is flat, maybe this is holding the stub shaft from not seating all the way in if in backwards? That is crazy if it is the bearing though. Your good german core is probably still better than that.
