diff --git a/cad/openscad/stamp_holder.scad b/cad/openscad/stamp_holder.scad
index 3ff7eac..cbc235c 100644
--- a/cad/openscad/stamp_holder.scad
+++ b/cad/openscad/stamp_holder.scad
@@ -34,7 +34,7 @@ translate([0,0,wall_thickness]) difference() {
 
 translate([0,0,wall_thickness]) linear_extrude(height=internal_height+wall_thickness) hull() {
     translate([-size/2-output_thickness-wall_thickness/2,size/4-wall_thickness/2]) circle(wall_thickness/2);
-    translate([-size/2-output_thickness-wall_thickness/2,-size/4+wall_thickness/2]) circle(wall_thickness/2);
+    translate([-size/2-output_thickness-wall_thickness/2,-size/4+wall_thickness/2]) mirror([1,0,0]) circle(wall_thickness/2, $fn=3);
 }
 
 
diff --git a/cad/openscad/stamp_holder_common.scad b/cad/openscad/stamp_holder_common.scad
index 2df94d1..50a2ed6 100644
--- a/cad/openscad/stamp_holder_common.scad
+++ b/cad/openscad/stamp_holder_common.scad
@@ -2,7 +2,7 @@ wall_thickness = 1.5;
 output_thickness = 1.5;
 internal_height = 26;
 center_radius = 10;
-output_radius = 3;
+output_radius = 1;
 size = 40;
 $fn = 500;