After waking at dawn the following day he discovered that his arm had begun to [decompose](https://en.wikipedia.org/wiki/Decompose) due to the lack of circulation, and became desperate to tear it off. Ralston then had an [epiphany](https://en.wikipedia.org/wiki/Epiphany_(feeling)) that he could break his [radius](https://en.wikipedia.org/wiki/Radius_(bone)) and [ulna](https://en.wikipedia.org/wiki/Ulna) bones using [torque](https://en.wikipedia.org/wiki/Torque) against his trapped arm. He did so, then amputated his forearm with his [multi-tool](https://en.wikipedia.org/wiki/Multi-tool), using the dull 2-inch knife and pliers for the tougher tendons. The painful process took an hour, during which time he used tubing from a CamelBak as a tourniquet, taking care to leave major arteries until last. The manufacturer of the multi-tool was never named, but Ralston said “it was not a [Leatherman](https://en.wikipedia.org/wiki/Leatherman) but what you’d get if you bought a $15 flashlight and got a free [multi-use tool](https://en.wikipedia.org/wiki/Multi-tool).”
[https://en.wikipedia.org/wiki/Aron\_Ralston](https://en.wikipedia.org/wiki/Aron_Ralston)
Just a article of interest for this multitool user …
by FenderGuitarsRock