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What can be done when the Pringle Switch doesn't open all the way?

Make sure that the switch id de-energized on both line and load-side.  After this has been confirmed, take a small mallet and hit between A and C phase lightly to open the switch.  After opening the switch, clean the switch contact with CRC-226 or equivalent  and then apply a coating of Rheolube 262 to the contact.  Test operate the switch.