Abstract: An arrangement for supporting electrical plug-in components which includes a mounting member defining an opening through which extend opposed flexible walls of a retaining unit having a bottom portion which carries one component to be secured, the component engaging the undersurface of the mounting member while shoulders formed on the edges of the retaining unit engage holding fingers extending into the opening of the mounting member. Locking clips are inserted between the electrical component and the retaining unit to prevent withdrawal of the socket and retaining unit. A relay fits between opposed walls of the retaining unit on the other side of the mounting member and includes a pair of radially extending pins which latch the relay to the retaining unit and also extend into recesses in a post fixed to the top of the relay to hold a latch operating knob and the pins to the relay.

Abstract: The relay contact adjusting arrangement of this invention involves the positioning of the header assembly and motor assembly of the relay in a fixed spaced relationship prior to final assembly, with the fixed and movable contacts in opposed pairs, and associated with an optical comparator so that enlarged images of the opposed contacts can be seen, after which adjusting tools are used to bend the supports of the fixed contacts for adjusting the spacing successively for each opposed pair of contacts to a spacing indicated on the screen of the comparator. The device includes a means for energizing the relay coil to hold the armature in a desired position while the adjustment takes place, and provides for the indexing of the assemblies through 180.degree. to allow both the normally open and normally closed contacts to be viewed on the comparator screen.