Good stuff right there.
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Leveling Tutorial by Tim Gillingham
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The only problem with all of that if the line you scribe on the wall is not on the same degree as your bow it can be inaccurate when you are aligning the pin to the line scribed on the wall. The only TRUE way to do that would be to use a straight edge that is on the same plane as the alignment pins. In other words if you are lowering your bow down so your alignment pin is on a 45 degree down angle, the straight edge you are eye balling against needs to be on a 45 degree down angle. This is a geometrical truth that we practice in fabrication and pipefitting. He is close, but he is not dead on
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