Abstract: A molded plastic ring having a mounting flange and a shield flange which collectively mask an automotive or truck tire during the painting of a supporting wheel. A beveled edge of the mounting flange is fitted to the wheel. The mounting flange projects from the shield flange in the range of 95 to 130 degrees. The shield flange extends from the mounting flange in a plane parallel to the wheel and overlies the tire sidewall. The ring is molded from polyethylene or other flexible materials impervious to encountered solvents, cleaners, thinners and curing temperatures. Radial slits or notches can be provided at the mounting flange to facilitate attachment and the mounting and shield flanges can exhibit arcuate curvatures, when viewed on edge.

Abstract: A tool is shown having a cross beam assembly (15) made of beams (18, 19, 20, 21) joined by a center box structure (23). The assembly (15) is adapted to be mounted by brackets (16) to the outer end of a cylindrical case (11). The center box structure (23) has a vertical shaft (25) rotatably mounted therein and extending beneath the assembly (15). Secured to the vertical shaft (25) is a radius arm (28) which is adapted to rotate with shaft (25). On the longer end of the radius arm (28) is a measuring tip (30) which contacts the cylindrical surface to be measured and which provides an electric signal representing the radius of the cylindrical surface from the center of rotation of the radius arm (28). An electric servomotor (49) rotates the vertical shaft (25) and an electronic resolver (61) provides an electric signal representing the angle of rotation of the shaft (25).