epp2 = epp1 + [ -body_front_overlap, 0 ];
epp3 = [ +body_depth -total_depth, epp2[1] ];
epp4 = [ epp3[0], +conn_thick/2 +prong_higher ];
epp2 = epp1 + [ -body_front_overlap, 0 ];
epp3 = [ +body_depth -total_depth, epp2[1] ];
epp4 = [ epp3[0], +conn_thick/2 +prong_higher ];