Both the central portion 23 and notches 24 open through the inner face 21. 27, 1962 tion 23 and which open inwardly thereof. ![]() The recess 22 includes a substantially circular central portion 23 and a plurality of equally spaced notches 24 which extend radially outward from the periphery of said central por- 3,0223%! Patented Feb. The body 9 has a recess 22which opens through said inner face 21 thereof. The body member 9 is generally in the form of a relatively thick disc having a substantially flat inner side or face 21.
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