is about u00bd u2033 or less holes 109 are preferably spaced apart from each other so as to distribute the additional mechanical interlocking around the plate 0068 fig7 a shows mating hole 32 and index hole 34 mating hole 32 is not required to be centrally located as is shown in fig7 a in an embodiment where the mating magnetic assembly is a circular cup assembly the distance a shown in fig7 a can be substantially the same as the radius of the circular cup the outline of such a circular cup is shown by dashed lines in fig7 a the oval shaped device in fig7 a and 7b may be formed from a metal strip or coil by punching holes 32 and 34 using a half shear operation to create a height difference between central portion 100 and outer portion 105 and further deforming outer portion 105 to create v shaped depressions 107 and separating the oval device from the strip or coil additional holes which partially define the oval and later aid in separation of the oval from the strip or coil can be punched at the same time as holes 32 and 34 for plate and flange assemblies made using this process the v shaped depressions are preferably not placed along the center line connecting.