i have my first order. I assembled the wheels with bearing in place, flip, shim, second bearing on other side, tightened with solid finger pressure. placed onto a gantry with spacer, then shim, then wheel, then nut. Tightened well. Wheel will sort of turn but not at all free spinning. I found one post that said maybe bearings not fully inserted so i placed on my bench and pushed them in hard so they are in as far as they go. Still the same. What have i done wrong?