Grizzly G4003G Owner's Manual page 40

Saddle Gib and Saddle Lock, see Figure 54
The saddle is supplied with a square head bolt
on the front right hand side of the slide. This bolt
is used to lock the saddle in place for increased
rigidity when making face cuts. Before making
adjustments to the saddle gib, make sure that this
bolt is loose by turning it counter clockwise.
It is important that the gib be properly adjusted.
A loose gib will cause finish problems in a
workpiece. A gib adjusted too tightly will cause
premature wear.
Figure 54. Saddle lock bolt and saddle gib
screws.
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G4003G Gunsmith's Lathe