Play in gantry. Adjustment corrections?

Been trying to figure out what wheels need to be loose and what ones needs to glide on the gantry wheels. Should the 4 top wheels on the gantry be loose or tightened? And the 4 on the bottom (under rail) be tight? Seems to be sloppy and effecting the cuts. Thanks

None of them should be loose
http://x-carve-instructions.inventables.com/1000mm/step2c/1zaxis/

OK Thanks I well try that now.

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