Riddle with locked-in screen

A riddle comprising a molded plastic rim having integral upper and lower flanges, and a sifting screen connected to the lower flange of said rim, said rim being formed in the shape of an inverted frusto-conical configuration with upper and lower ends, said integral upper flange being a solid thickened mass and extending outwardly from said upper end, said integral lower flange also being a solid thickened mass and extending inwardly from said lower end, said lower flange having an annular recess located interiorly of said rim and opening upwardly, said annular recess having a cross-sectional configuration that tapers downwardly on opposite sides thereof to an enlarged ball-head shaped opening which has a diameter exceeding the width of the downwardly tapering portion of said annular recess for at least most of the height thereof, said downwardly tapering portion being generally centrally positioned relative to said enlarged ball-shaped opening and having a height greater than the diameter of the ball-shaped opening, said sifting screen having a flat circular configuration with a downwardly extending peripheral edge that is configured and dimensioned to be mounted within and generally centered relative to the downwardly tapering and enlarged ball-head shaped openings of said annular recess, and cement deposited within and generally filling the confines of the downwardly tapering and enlarged ball-head shaped openings of said annular recess to positively lock said generally centered screen to the lower flange of said rim.