Big Al i would use piece of pipe and if tire was loaded i would weld with tire on and stem on bottom,using a wet cloth to cool the weld in small amounts, it doesn't take much weld to hold the pipe in place, a couple tackes on either side will stop a stik from damaging the stem. if the tire is not loaded i would let air out and break the beed, i have heard an air filled tire will biuld up some kinda gass which can lead to explossion of tire, i don't know if its true, but if the beed is broke and fresh air is about it should be safe. IF YOU have tubes in tire you'll have to remove them i almost forgot some pepole get tubes when they load the tires,never thought it nesesary myself loaded tires had been fine on the old farm tractors for years.