diff --git a/serre-tringle.scad b/serre-tringle.scad
index 1afdfc4..1a10355 100644
--- a/serre-tringle.scad
+++ b/serre-tringle.scad
@@ -4,7 +4,10 @@ $indent_width = 1;
 $diameter_z = 6;
 $length_base= 7;
 $length_hat= 2;
+$delta_hole = 4;
+$diameter_shaft = 2.5;
 $length_blocker = 5;
+$height_blocker = $length_blocker + ($length_base - ($delta_hole + ($diameter_hole/2))) + ($diameter_hole-$diameter_shaft);
 $diameter_blocker = 10;
 $radial_indent = 1;
 $slack = 0.1;
@@ -16,7 +19,7 @@ $fn = $preview ? 32 : 64;
 // base
 difference() {
     cylinder($length_base, $diameter_z / 2, $diameter_z / 2);
-    translate([0, 0 , 4]) rotate([90, 0, 0])
+    translate([0, 0 , $delta_hole]) rotate([90, 0, 0])
         cylinder(6,$diameter_hole/2, $diameter_hole/2, center=true);
 }
 
@@ -57,7 +60,7 @@ difference() {
 // blocking piece
 translate([20,0,0])
 difference() {
-    cylinder($length_blocker, $diameter_blocker / 2, $diameter_blocker / 2);
+    cylinder($height_blocker, $diameter_blocker / 2, $diameter_blocker / 2);
     translate([0, 0, -$mini_slack])
-        cylinder($length_blocker + $slack, $diameter_z / 2 + $slack, $diameter_z / 2 + $slack);
+        cylinder($height_blocker + $slack, $diameter_z / 2 + $slack, $diameter_z / 2 + $slack);
 }
\ No newline at end of file
diff --git a/serre-tringle.stl b/serre-tringle.stl
index 760061c..66b5130 100644
Binary files a/serre-tringle.stl and b/serre-tringle.stl differ