For owners, evidently there is a problem coming to light with the bottom wheel adjustment. Saw this on another web site and here is the Rikon link for proper adjustment. Some have found stripped adjustment bolts when they checked,
http://www.rikontools.com/lowerwheeladjustments.pdf
HTH
Go
http://www.rikontools.com/lowerwheeladjustments.pdf
HTH
Go