Various metals will react to each other, the light coating of grease acts like a barrier to prevent this reaction from happening. The grease is not used to make the wheel turn better. That is the role of the grease inside the bearing, not on the axle or on the hub.
What if the axle will not reinstall.
It is likely that one or both of the bearings are not perpendicular to the caster or hub shaft. Follow the each bearing around its outer diameter, by eye or with your finger. You are trying to determine if the bearing is off angle to the shaft and axle. If the bearing is slightly off, find the high side and lightly tap the bearing into place with the hammer and insert tool. You may have to remove and reinstall the bearing.
What if I have more questions?
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What if I need a tool adapted?
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What if I do not see a tool that I want?
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