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Its a simple process of using a stranded rubbery stringy stuff threaded thru a slot in the pointed awl tool and finding the hole and threading the awl into the hole leaving 1/4 of the strand outside the hole and then pulling the awl back out with another 1/4 of the strand on it. Cut the strand where it passes thru the awl and the soft rubber "should" bond with and seal the leak.
But...I have had them fail or work their way out of the tire. When I was a wee lad and worked at a service station (a "Sinclair" which show just how far back this was) we always dipped the string in tire cement (super gooey stuff) before filling the hole. And this was on BIAS PLY tires only not Radials.
My local tire shop, Poor Fredies Mud Hole of Jamaica,NY, will not do this method. They will only remove and patch from the inside AND they mark the rim and tire so they can remount with a much smaller chance of needing a rebalance.
The string/awl method would probably work fine in a roadside fix as long as you can locate the leak and have a compressor to refill the tire.
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