The gantry sags a significant amount. Normally, this could be compensated for by leveling the bed, but the sag is worse when the gantry is going upwards than when it's going down.
For disassembling the wheels, I don't have the top rails on my LM, so I will pull the whole gantry off and remove all of the wheel assemblies from the z plates. For getting the wheel assemblies apart, you should be able to take the bolt out and shake the wheel to get the spacer in between the bearings to move off center. Then you can use that same bolt to push on the spacer to push the spacer and bearing out the other side of the wheel. If the spacer is stubborn and won't dislodge enough for you to push on it, wrap your thumb and index finger around the wheel and give a couple of quick taps of your thumb against your leg or a tabletop and that should dislodge the spacer enough. Just don't smack the wheels directly on a hard surface to try to dislodge the spacer.
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