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The most appropriate tool for applying thrust bearings to a shaft is the arbor press. This tool is specifically designed to exert a controlled amount of force for pressing or fitting components together, which is essential when inserting thrust bearings onto a shaft. An arbor press allows for precision and minimizes the risk of damaging both the bearing and the shaft due to its ability to apply even pressure.

Using an arbor press ensures that the bearing is seated correctly and aligned without excessive force that could compromise the integrity of the components. It provides stability and is well-suited for tasks that require mechanical advantage, making it a preferred choice in situations where bearings must be installed accurately and securely. This control is crucial in preventing issues related to misalignment which could lead to premature failure of both the bearing and the machinery in which it is used.