This allows the inside edge of the washer to serve as a guide for the tip of the torch. I use Vice-Grips to hold the washers in place in a predetermined location. The result is a smooth, accurately sized hole. When starting new trees or evergreens, place a used tire over them and fill with mulch. They grow faster and are protected when mowing.
Tires make it easy to cut around trees with a weed eater or mower.
A 15-inch auto rim is always carried in the back of my pickup. When positioned against a post with a block in front of it, it's the perfect lever for vertically lifting out a wooden or steel post. I was tired of always carrying pipe on foot in tight spots in the field. I took the torch to an old damaged pipe gate. I fastened them to the front and back luggage racks with a 3 8-inch bolt.