I trued the front tires of the ThunderSlot carefully and discovered three things. The front axle is NOT knurled, so the plastic wheels side off without damage. The plastic wheels have inserts so I could put the tire truer axle through the wheels. I trued very carefully, test driving twice, still hopping after first true. Then discovered that the fronts were true but soft, very unlike our usual hard zero grips. I did not run laps after the last true, but expect real good times. This is also the car that lost a front axle height adjustment grub and I am still waiting for those parts.