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It's not jerry rig. It's jury rig. Short for injury rig. Leave Jerry out of this.
(EDIT: Wikipedians seem to believe it's short for ajurie rig or rig du jour. The OED says "Origin unknown." Jerry remains an innocent bystander.)
(EDIT: Wikipedians seem to believe it's short for ajurie rig or rig du jour. The OED says "Origin unknown." Jerry remains an innocent bystander.)