As example of still another form is shown in FIG. 7 where an end piece 15 is fabricated from a sheet of plastic, for example, with an inner protective portion 17 and an outer decorative portion 19, the outer portion having been folded at a central area 2l and a pin 23 passed through the facing folded portions to act as an axle for five reduced thickness ribs or convex bands 25a 25e which are simil