public void setWorldObj(World world)
{
super.setWorldObj(world);
if(_grindingWorld != null) _grindingWorld.clearReferences();
if(this.worldObj instanceof WorldServer)
_grindingWorld = new GrindingWorldServer((WorldServer)this.worldObj, this);
else
_grindingWorld = new GrindingWorld(this.worldObj, this);
}