Abstract: Control levers have utilized various switch assemblies mounted within the grasping portion thereof to control multiple machine functions. The mounting of the switch assembly within the control lever typically provides an opening in the control lever that is somewhat larger that the switch assembly to accommodate relative movement therebetween. In many instances problems have been encountered because foreign matter is allowed to enter the interior of the control handle through a space that exists between the switch and the control lever. The present invention provides a seal plate between the a switch member and a cover member defined by the control lever. The seal plate is positioned about the switch member to cover the opening between the switch member and the cover member. The seal plate is continually biased into engagement within a relieved portion defined on an interior surface of the cover member by an abutment portion defined by the switch member during the full range of movement of the switch member.