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hex wrench size for Big Mouth Air Vent BJ-3BM?
I feel exasperated. I have a set of large hex wrenches (3/8 through 3/4 inch) but nothing fits
1/2 too small
5/8 too big
9/16 too small
I am about to grind a chisel to install, but I wish I could just have the order the proper tool. Is it metric? Is my hex set defective?
I appreciate pointing out my mistake.