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Helping install a hold-down roller on a conveyor. Employee was watching co-worker use a hammer and chisel to seat a bearing onto the roller shaft. As the co-worker struck the chisel with the hammer, the employee was struck in the right eye by a flying object (small piece of metal)

Changing hammers in HSI crusher, employee was using a hammer to drive wedge out . . . struck his own left index finger with the hammer.