In addition to LOTO (lock out tag out) remember that there is also 'stored energy'. not familiar with how pin setters work but stored energy is the gravitational force. think of a jackstand under a car that is jacked up. you may be working on a hydraulic press and lock out the electrical but when the press is raised there is still stored energy. placing a wood block or a stop of some sort will protect you from that stored energy being released. in the scenario of a pin setter think of placing a piece of 4x4 under it to prevent it from falling
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