Treadmil with mv

How yo make treadmil ground with MV

<C><P /><Z><S><S P="0,0,0.3,0.2,0,0,0,0" L="221" H="118" X="103" Y="427" T="0" /><S P="1,0,0.3,0.2,0,1,0,0" L="370" H="76" X="402" Y="403" T="0" /><S P="0,0,0.3,0.2,0,0,0,0" L="253" H="117" X="716" Y="422" T="0" /><S P="1,-333333,0.3,0.2,0,0,0,0" L="10" H="10" X="360" Y="162" T="0" /></S><D><DS Y="345" X="116" /></D><O /><L><JP M1="3" MV="Infinity,9.9" M2="1" AXIS="1,0" /></L></Z></C>


Link to negative ground make sure there are 2 to stop it, LOOK AT THE XML