Alright, here's a dumb question. I have a tire plug kit for my mower tires. Are these plugs the same that they use in car/truck tires? The reason I ask, I have a screw in my truck tire and if I can just plug it myself with the plug kit that I have, rather then take it to a tire place and pay them $35 or whatever it is, I'd certainly rather do it myself. Anyone??