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I think You'll find it a reverse cantilever issue. Heavy weight in the center makes the beam bow downward, and deflect the ends upwards. The most deflection and hence, misalignment, would be at the ends, rollers 1 and 6. Look at 2-5, if 3-4 have the least, I would suspect this.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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