Mercury 50 4-Stroke Manual page 84

2. Remove the spark plug leads to prevent the engine from
starting.
3. Straighten the bent tabs on the propeller nut retainer.
4. Place a block of wood between gearcase and propeller to
keep the propeller from turning. Remove the propeller nut.
5. Pull the propeller straight off the shaft. If the propeller is seized
to the shaft and cannot be removed, have the propeller
removed by an authorized dealer.
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