ujoint smoothness Q

I like the vid except for the install, especially the hammer method. Push first cup 1/2 way through yoke eye. This gives you enough to slide cup over trunnion without tipping an needle.
Sometimes they are tight,no getting away from it. Rough is a crushed needle.
And if you ever buy a u-joint in a box that was obviously opened, inspect it before leaving store. 1, missing needles,2 matching cups,3correct u-joint and 4 contamination.
I just gave you four reasons how i know. Been there.