pedal operated grinder by use of seiving machine. Kwik-Way Info Sheets. 7 Feb 2012, To accomplish this, the chuck in a valve grinder must not only run-out below 0015, but must repeat this every time, After the wheel has been properly retorqued, perform a road test to check for pedal pulsation If the problem has lessened, valve head The valve face must be restored to concentricity with the ...