8.75 Sure Grip axle end play - left side

Not necessarily, the second set of splines isn't as wide as the outside set.




This^^^^ is why I don't think they are seated, or at least one of them isn't. If they were then they would both be in contact with the thrust buttons.

Very good. I'll try what you say. I suppose I should run the adjuster nut on the right side all the way INWARD first to create the room, yes?