anyone here use tire groovers to put an edge back on their tires? especially the "used tire budget" types like myself. I was looking at options and it seems like they come it two versions, cheaper and expensive. Id like to opt for the 85 dollar one but if i want to grove the outside edge of my tires during service, the 400 dollar one seems to be a faster cutting, instant on kind of deal and looks to be overall of a higher quality. Anyone have experience? Im going to look for used options as well.