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To prep for the Y rail installation we need to assemble the X carriages and idlers. Locate the X carriage labelled as the "Front".
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Begin by holding the shoulder bolt so the threads are pointed up. Place (3) M5 washers on the bolt, followed by (1) M5 shim. Next put on a toothed idler. Then another M5 shim, then a smooth idler, followed by a final M5 Shim.
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Visually look to see that the final shim is very close to level with the "shoulder" of the bolt.
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If there's a gap, see if it's best filled by a shim, or a washer. You want to place those before the first shim you put on.
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If instead the shim sticks out past the shoulder, you may need to remove a washer and replace it with a shim.
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