Getting Stuff Centered in Google Sketchup

[Trumpkin]

Is there a trick for getting wheels centered on an axle in Google Sketchup?

[ArcMan]

Just select the wheel and move the center point of it to the center point of the axle.  The inference engine takes some getting used to.  If the center point snap doesn't appear, hover around the edge of the shape for a bit, then move to the center.

[pomprocker]

You have to change viewing mode from solid to transparent, then look at the wheel dead on you can now grab the center point of the wheel and line it up with the center point of the axle.