ah. your right…
i used a normal grinder…
I started on mine yesterday.. used a knife with really thin blade, dont know that it’s called in english, but it’s very sharp, and you just press more blade out when you need. i worked in like an hour and got 1/4 of the tire.. gonna do more today when i get home from school and then im gonna sand it.. it’s a maxis CC btw. cuz im buying a new try-all white tire 