diff --git a/secret_nut.scad b/secret_nut.scad
index ca61b01..c1a293e 100644
--- a/secret_nut.scad
+++ b/secret_nut.scad
@@ -1,4 +1,4 @@
-# secret nut for my subaru impreza (not model, real car :))
+// secret nut adapter for my subaru impreza (not model, real car :))
 
 module sekretka(z) {
 union() {
@@ -27,7 +27,7 @@ union() {
 union() {
   translate([0, 0, 13]) cylinder(r=19/2/sin(60), h=13, $fn=6);
   difference() {
-    cylinder(r=11-0.25, h=13, $fn=50);
+    cylinder(r=10.75-0.25, h=13, $fn=50);
     sekretka(0.25);
   }
 }