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I too have had mixed results with mine. Sometimes it stays ok and other times it pops off without a lot of pressure. Give that clamp all you have and then a little more.
I took my hand grinder and scuffed it up. Pretty good. Rubbing my hand across it feels like what a city street feels like. . Don't have to be a perfect seal but it needs to hold. So it don't pop off and catch you in the face. In only use 15 also.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.