Cable skidders have a fixed arch over which the cable runs through a fairlead.
The rollers provide a low-friction fairlead for the lift wires or chains.
Smaller cables can be used but they aren't as well supported in the fairlead sheave grooves and will experience wear.
Test each roller chock and roller fairlead for freedom of movement.
When necessary, the mooring dynamics are evaluated separately as a post processing after obtaining the fairlead motions.
The separation of the rudder control cable at the aft fairlead, as a result of wear.
British Dictionary definitions for fairlead
fairlead
/ˈfɛəˌliːd/
noun
1.
(nautical) a block or ring through which a line is rove to keep it clear of obstructions, prevent chafing, or maintain it at an angle Also called leader