What could cause the Von Duprin EL solenoid not to hold when mechanism cover plate is slide over the solenoid?

If mechanism cover plate causes the EL solenoid to drop when slid over the solenoid, the solenoid plunger requires adjustment.  You must lengthen the rod by turning the hex nut in front of the plunger to show more threads (about 7-10 threads).  This makes the rod length longer allowing the plunger to pull deeper into the solenoid during the inrush current period.

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