3. Holding the frame by hand, loosen the lock nut with 10 mm spanner. By the turning of the
frame, achieve zero value of the digital protractor. While holding the frame by hand, tighten
the lock nut.
Option 2.
1. Place a ruler vertically touched to the edge of the frame and rest it in a at table surface.
Make measurements on both sides.
2. Holding the frame by hand, loosen the lock nut with 10 mm spanner. By the turning of the
frame, achieve equal values. While holding the frame by hand, tighten the lock nut.
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