main_thick = 3.3;
main_in_dia = 28.9;
-horn_ext_dia = 20 - 0.5; //?
+horn_ext_dia = 20 - 0.5;
-horn_c_x = -4.6; //?
-horn_c_dy= -4; //?
+horn_c_x = -4.6;
+horn_c_dy= -4;
-blhook_start_ang = 45; //?
+blhook_start_ang = 45;
blhook_str_len = 2.9;
-blhook_mid_rad = 3.5; //?
+blhook_mid_rad = 3.5;
width = 20;
+// computed
+
mc_mid_rad = main_in_dia/2 + main_thick/2;
mc_bl = circle_point([0,0], mc_mid_rad, 270-blhook_start_ang);