Issues with x axis wheel not snug again again the aluminum

So my machine came, but the lead screws would not fit the flange bearings? sienci sent out new lead screws and flange bearing quickly and that problem is solved.

My next problem is I can’t get the x-axis is wobbly. All 4 wheels from the z-axis are not snug against the extruded aluminum? Anyone else have this issue? My y rails are just fine. No matter how I set the concentric bolt, lose or tight it’s just not snug? What am I missing?

The are a good 2mm loose

Think there was a problem with the diameter of some wheels, but they were to large…link

@hobbyhands Another user reported this problem some time ago. It turned out that the wheels were not riding properly on the X rails. It may be a place to start.