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rack. Over time, it is normal to experience wear in both the guides
and in the part of the leg that is in direct contact with the guides.
This wear in both the leg guides and the leg should be monitored.
When the leg guides are excessively worn, they should be
replaced. If leg wear should become excessive, the leg should be
repaired.

Figure 1.5 -- Pin and hole elevating system of
Jack up rig

Figure 1.6 -- Rack and Pinion elevating system of
Jack up rig

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