Abstract: The combination of: a scaffold assembly comprising a vertical member; a baseplate on the vertical member and having a downwardly facing surface; and a foot having a top surface and a bottom surface spaced in an axial direction. The foot has an opening in the top surface and a recess extending axially from the opening toward the bottom surface. The recess accepts the baseplate with the baseplate in an operative position. The downwardly facing surface bears on the foot so as to cause a downward force produced by the vertical member to be applied to the foot and distributed by the foot through the bottom surface to an underlying support surface for the scaffold assembly. The bottom surface on the foot has a peripheral edge that bounds an area that is greater than an area bounded by a peripheral edge of the baseplate.

Abstract: An improved mud sill, for use with a generally horizontal baseplate of a base screw jack of a vertical scaffolding member, is taught that is easy to install and remove without tools and with a minimal amount of labor required. The improved mud sill attaches securely to the baseplate of a screw jack or scaffolding assembly without the use of extraneous fasteners, such as nails or screws. A multi-layered recess is provided in the improved mud sill to receive a baseplate axially and then the improved mud sill can be rotated relative to the baseplate to secure it in place. Once installed the improved mud sill of this important invention is restricted three dimensionally to the baseplate and yet it can easily be removed by a counter-rotation. No tools or fasteners are required.