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Building the idler stacks is very similar to how the stacks were built for the Y carriage stacks.

There are photos to accompany this step in the next step.

For the front idler, the stack for the outside bolt is the short stack. Turn a 12mm shoulder bolt upside down and install (1) M5 washer, then (1) M5 shim. Next add the 20T idler, then lastly (1) M5 shim.

You want to be sure the total stack is just slightly below the shoulder on the shoulder bolt. If there is room for another shim, take the last shim and pulley off, and put the extra shim on before the pulley.

Install the shorter idler stack in the outside hole on the idler mount.

For the front idler, the stack for the inside bolt is the tall stack. Turn a bolt upside down and install (3) M5 washers, then (1) M5 shim. Next add the 20T idler, then lastly (1) M5 shim.

You want to be sure the total stack is just slightly below the shoulder on the shoulder bolt. If there is room for another shim or washer, take the last shim and pulley off, and put the extra shim on before the pulley. If you can fit an extra washer, be sure to put it on before the first shim.

Install the taller idler stack in the inside hole on the idler mount.

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