tools - knob of propane tank was stuck - Home Improvement Stack

I used the grill last year, and am planning to replace the propane tank. However, I found that I could not turn the knob. I marked the knob with red color in the following figure. I guess it maybe

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How do I split these stumps? I've done the entire tree, but my axe just bounces off, and I can't get the wedge in no matter how hard I try. What else

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Propane Tank Tool Box : 10 Steps - Instructables

Propane Tank Tool Box : 10 Steps - Instructables

Propane Tank Tool Box : 10 Steps - Instructables