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its easy to set the axle center line square to the main center line by using the 4 6 10 formula. like a framing square on the floor, the main line 6 feet, axle line 4 feet, end of the 4 foot mark back to the 6 foot mark is 10 feet, a triangle, when the measurements are on there marks its square. wish i could show a drawing to make clear. its amazing how easy the build goes with those lines and plum bob.

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I wish you could show a picture too...

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