BobsCNC Evolution Series - Page 109

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WARNING Prior to installing the Lower Rails,
adjust the Eccentric Spacers so that the lower
Bearing Assemblies are at their lowest position.
Step 3 Observe the SG20U Bearing while turning the hex head of the
Eccentric Adjustment Spacer until you see that the Bearing is set
to its lowest position. Do this for all four of the lower Bearings.
Using a Sharpie, mark the hex point closest to the outermost
adjustment mark as shown.