I hear ya Oldmachinist , when I first seen it done I thought " that's insane " , it is a very dangerous thing to do , if someone put too much it probally could blow the tire off the rim into little pieces ------------------I am pretty proud of my homemade Cheeter tank ,in a bind I will change my tires at home , wish it wasn't so hard to post pics as I would show it to you'll , I took an old air tank off a scraped truck , welded a couple of nipples and a handle to it ( which really shouldn't be done as the air tanks are certified with a tag ) and really shouldn't be welded on , a couple of valves , a tee and a gauge , for the nozzle I took a piece of pipe and hammer it down with a piece of 1/2 " bar inside to give it the shape , then pulled the bar out , the Chheter is a work saver ---------in fact I used it not long ago at a tire store , I was having a tire put on my truck , it was a stiff 245/85/16 and they guys could get it to seat , they wasted a good 20 minutes trying , so I offered the Cheeter out the back of my truck , they had never seen one and was amazed that it seated it first pop , they gave me the new valve stem free for helping them out