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Build the Idler assembly onto the gantry panel as shown.

M4 x 30mm

M4 Penny Washer

M4 Washer

624zz Bearing

M4 Nyloc Nut

The longer bolt is used here, as it also acts as an end stop trigger for the x-axis.

Note the orientation of the aluminium gantry beam, double-check the Idler is installed in the correct position and on the correct side.

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