P7 = [ P6t[0] + (P6t[1] - P1[1]) / outside_pushslope,
P1[1] ];
-outside_push_inadj_slope = (P3t[1]-P4[1]) / (P6a[1]-P5[1]);
-
P3a = P3t + [ -outside_push_inadj, 0 ];
P6a = P6t + [ -outside_push_inadj, 0 ];
+outside_push_inadj_slope = (P3t[1]-P4[1]) / (P6a[1]-P5[1]);
+
module ExtrusionSect(){
cr = openingedge_dia/2;
toph = opening_height/2 + opening_protrh;