Abstract: A screed device (41, 42) formed by an elongated straight rigid member (54) that includes a pair of spaced threading assemblies (62) extending through member (54) between its rounded front side (47) and its back side (57). Each assembly (62) includes a screw (63) with a tapering neck (66), a head (64) for turning the screw (63), and a threading screw portion (67) projecting beyond the back side (57), along with a pair of bushings (71, 72) disposed within member (54) and in which the tapered neck (66) rotates, providing for the threading screw portion (67) to thread to a stud (22, 23, 24). The inner bushing (71) attaches to the tapering neck (66), to provide a cylindrical outer surface (75) that engages a cylindrical inner surface (76) on bushing (72) that is attached to member (54). Levels (78) are included in one wall (55, 56) of member (54).