crewpunch_biggest_y =
crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1];
-holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all;
+holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all
+ + max(0, -crewpunch_skew_yoff);
attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall);