FIG. 1 is a top-front perspective view of the toy construction set element of my design; FIG. 2 is a bottom-rear perspective view thereof; FIG. 3 is a bottom plan view; FIG. 4 is a right side elevational view; FIG. 5 is a top plan view; FIG. 6 is a left side elevational view; FIG. 7 is a rear view thereof; and, FIG. 8 is a front view thereof.