To prep for the Y rail installation we need to assemble the X carriages and idlers. Locate the X carriage labelled as the "Front".
Insert an M3 x 10mm Button head bolt into the bottom of the X Carriage, and an M3 x 16mm button head bolt into the long horizontal hole in the X carriage, until they're flush with the inside edge.
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.
Visually look to see that the final shim is very close to level with the "shoulder" of the bolt.
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.
If instead the shim sticks out past the shoulder, you may need to remove a washer and replace it with a shim.
Once the "stack" is level with the shoulder, thread it into the X carriage (I leave the shoulder bolt pointing up, and turn the X carriage down onto it, being careful not to cross-thread it).
The shoulder must be tight against the X-Carriage, with as little vertical play as possible. If the idlers don't spin smoothly, it's too tight and you need to remove a washer or shim. THERE MUST ALWAYS BE A SHIM DIRECTLY AGAINST EACH SIDE OF THE IDLERS.
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