arm_depth = 25;
arm_innerwidth = 9.60 - 0.50;
arm_innerheight = 8.90 - 0.50;
-arm_pin_depth = 18.50;
+arm_pin_depth = 18.50 + 1.0;
arm_pin_dia = 1.5 + 0.7;
armpart_hex_rad = 15;
hingenut_depth = 4;
hingenut_clear = 5;
-headpart_main_dia = 15 - 0.0;
-headpart_main_len = 16;
+headpart_main_dia = 15 + 0.3;
+headpart_main_len = 16 + 1.1;
headpart_stub_protrude = 2;
-headpart_stub_width = 11.7 - 0.3;
+headpart_stub_width = 11.7 - 0.6;
headpart_flatten_angle = 45;