Don't test it with your finger, stick the axle through the hole, that holds everything in the correct aspect to test. The inner races and the space effectively become one and never move independent of each other.
It's a deep groove magneto type roller ball bearing, it does not need or have preload, it just has near zero extra clearance.
I mis spoke when I said preload.
I should have said "clamp"
When you tighten the axle nut, it should CLAMP any spacers and the inside diameter of the bearings, they should not spin. The outside of the bearings, captured in the wheels and carrier should spin... in relation to the motion of the earth... and the inside of the bearings and the axle, which remain stationary in relation to the rest of the bike.
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