Thank you for the exposition of your Slot.it McLaren modification experience. You expanded my knowledge considerably for many of my car prep work. I never got my M8D guide to work correctly, I raised the nose with a washer, the front wheels did not work correctly then, and the wires caught on the interior. I hoped I could work it over and add wide wheels and tires like the Porsche 917/10. For a CanAm class race I think this settles my choice on the Porsche917/10.