Abstract: A linkage apparatus for a pair of relatively pivotal elements, such as the pivotal jaws of a hand tool, preferably includes at least a pair of linkage members pivotally interconnecting the pivotal elements. Each of the preferred linkage members is pivotally pinned to the pivotal elements and includes elongated apertures therein for receiving and supporting the pivot pins of the other linkage member.

Abstract: A hand tool for inserting or removing electrical contacts from rear release connectors has an elongated body split lengthwise into a receiver and a cover each of which carries one of a pair of contact holders which are adapted to hold a contact therebetween. The cover is pivotally attached to the rear of the receiver and can be opened for changing or ejecting contacts into or from the tool. In the closed position the cover can be positioned forwardly to align the ends of the contact holders for removal, or rearwardly to misalign the ends of the contact holders for insertion, of a contact from or into a connector.