Plugs can and will work, but if a customer wants a tire plugged, I say sure, but you will have to do it yourself. Too many variables, mostly when someone says I didn't drive on it very far flat, and you dismount the tire only to find enough rubber crumbs to fill up a coffee can. Good luck trying to remove a bent deck screw at a 45 degree angle with the head wore off so you can plug it without making 2 holes in the tire. If you insist on plugging, a carbide 1/4 in. pointed reamer on a drill makes it a lot easier, although I only plug lawnmower tires. Every hole is different.