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The side cover may be held by one or more central bolts, or by screws round the flange. Undo the bolts or screws and remove them.

Leather oil seals are commonly used for parts that are exposed to dirt and poor lubrication. The major advantage of this material is that it can function in cases where synthetic rubber cannot function. They are used for shafts that have rough surfaces that are more than what rubber seals can handle. This is because they are pre-lubricated and have the capacity to absorb liquids.

Remove the key and keep it safe until ready to refit the pulley.