Planmeca ProMax Pan/Ceph Calibration Manual page 45

Figure 73a
Press Lock (Figure 74)
Press Release then twist the worm gear away from the column. (Figure 75)
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22811.20.Rev001 07.31.2018
Put the locking pin into the c-arm/elbow. (Figure 73a-b)
Figure 74
Figure 75
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Figure 73b
45