in fig3 and in detail in fig3 a preferably the hook is bent at an angle from the general plane of the rest of the shim body the bend 90 may be perpendicular to the shim body although it is not necessary that it have a precise right angle the shape of the hook is preferably something like a letter j although variants are also envisioned shaped more like a truncated letter v a more or less straight downward first portion or segment 60 is preferably followed by a more or less curved bottom and upwardly extending second portion or segment 70 terminating at a flat or pointed terminal end 80 alternatively although not shown all or a portion of the first segment may be round and all or a portion of the second segment may be straight or flat the overall length of the hook from bend 90 to terminal end 80 is preferably between approximately 7 to 8 mm the overall downward reach of the hook is preferably between approximately 4 to 5 mm the overall width of the hook 40 is preferably between approximately 3 to 5 mm the shim 10 is preferably made from a thin steel sheet thickness preferably less than about 2 mm it may have one or more coatings applied such as anti rust or anti fingerprint coatings the shim may also be painted enameled printed or embossed all as well known in the art the shim may be a multi layered composite such as a steel core with one or more non metallic layers u2014 e g rubber or elastomer an example of a typical.