We used a string tied to a screw that was centered on one end of the inverted "V" angle. Stretched the string very tight down the top of the V and aligned to that. Then with the other side, we took measurements between the angles with a tightly stretched tape about every foot, and made them parallel. It's very important that the center to center wheel spacings match the point to point spacing of the inverted angles. You would do best to hold off on putting the wheels on the other side until you test fit the "roller box" north and south sides. I assembled the entire roller box upside down in my driveway and got the wheel spacing correct while having it all temporarily fastened together, including the corner braces. Then I numbered the pieces in the correct orientation, took it all apart, and hauled it to the site when ready for final assembly. We laid the laminated beam sides up on the walls at an angle, put the rollers on, stood them up, installed temporary outside bracing, then put the north and south pieces and corner braces on. Make sure the grease fittings on the wheels are facing toward the inside of the building.
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Observing since 1966
Messier Cert #898
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