Change config after few test in real live.

config/hole.scad

@@ -1,2 +1,2 @@
-hole_entrance = 12;
+hole_entrance = 13;
 hole_holding = 6;

config/hook.scad

@@ -1,5 +1,5 @@
 hook_mounting_hole = 3;
-hook_entrance_margin = 1;
+hook_entrance_margin = 2;
 hook_entrance_height = 1.5;
 hook_holding_margin = 0.2;
 hook_holding_height_margin = 0.2;