Abstract: Twist-in mounting structure comprises a barrel, and panel capture tabs extending oppositely away therefrom, each terminating in a free end spaced away from the barrel. Each tab has an interference surface sloping downwardly and inwardly toward the barrel, and an interference region bounded by the interference surface. An acute angle is included between the interference surfaces and a cooperative raised capture plateau lying below them. A spring locking arm, sprung out of the plane of the housing mounting surface, provides a distal locking element. The housing mounting surface provides structure for laterally capturing the locking arm.

Abstract: An electrical switch with low profile and small button motion has a button close to a pivot and includes a ring like structure with bearing areas to open and close contacts. The actuating button is situated in an aperture and covered with a flexible membrane which seals the switch, prevents entry of dirt and gives an indication of the switch.