Under Rule (i) for the Coffee Can racer: Attachments to the sides of the coffee can may be made as long as they do not violate any of the Rules and only minimally change the size of the racer (no more than 3 cm extra on each side or 6 cm total).

May attachments in accordance with Rule (i) touch the surface of the ramp or would they violate Rule (h) by changing the friction? Are attachments similar to the one shown here: https://youtu.be/oPmNQeTxD_A?si=v5ZCgYeEi4ymoop9&t=56 allowed?