elongate holes 450 the flat blank grounding spacer 410 could be formed from a flat piece of sheet metal and does not have any raised surfaces a piece of sheet metal could be cut e g stamped into a desired shape e g circular with a desired number of elongate holes 450 radially spaced as shown the sheet metal could be cut such as by stamping into a circular shape having an outer diameter 430 and a central aperture 432 this is an intermediate step in manufacturing the grounding spacer prior to creating the raised rims that provide the penetration features of the grounding spacer fig1 is an enlarged view of an elongate hole of the flat blank grounding spacer 410 of fig1 the elongate hole includes a first arc 452 a second arc 454 opposite thereto and an inner arc 458 and an outer arc 456 separating the first and second arcs 452 454 a first portion 463 is defined by the first arc 452 and the bend line 460 and a second portion 461 is defined by the second arc 454 and the bend line 460 the first portion 463 and second portions 461 could be formed into rims such as shown in fig8 12 by bending or pushing e g stamping the first portion 463 up and the second portion 461 down such as along the bend line 460 the inner and outer arcs 456 458 facilitate the manufacture of the penetration features and also relieve stress placed on the penetration features when assembled having thus described the disclosure in detail it is to be understood that the foregoing description is not intended to limit the spirit or scope thereof it will be understood.