One of my customers came into the office in our auto repair center and showed me a Knucklehead® that had survived real torture. He's a car mechanic and after doing some repairs, he forgot his Knucklehead® on the exhaust under the car he was working on.

After about six months, his customer came in for service, and there was the Knucklehead®, still clinging to the exhaust pipe. The owner of the car lives on a gravel road and drives the car every day. We also get a lot of snow here in Sweden and we use a lot of salt on our roads, so that light took a lot of abuse. But the Knucklehead® still works!