Ours also has that knob. I learned about it on the board when we first bought our TM in 2003. There may be others who are unaware, so this may be a help to them.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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