Sharp 1840TC-FC Instruction Manual And Parts List page 43

3.10.4 Saddle
If the gibs between saddle and bed become loose, it will affect the accuracy of
saddle travel. Check and adjust them every six months according to the following
steps.
1. Use flat head screw driver to loose the adjust screw "A" and "B" about 1/2
circle CCW.
2. Appropriately tighten adjust screw "C" and "D" about 1/2 circle CW.
3. Move saddle left and right to a satisfi ed smoothness.
Figure 13
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