diff --git a/latch.scad b/latch.scad
index 51462a1..d11a629 100644
--- a/latch.scad
+++ b/latch.scad
@@ -21,13 +21,13 @@ module _top_post(thickness, axis, ridge, funnel, tol) {
     }
 }
 
-module latch_top(spacing=10, thickness=3, axis=2.5, ridge=.5, funnel=.7, tol=.2) {
+module latch_top(spacing=10, thickness=3, axis=2.5, ridge=.7, funnel=.7, tol=.2) {
     translate([spacing/2, 0, 0])      _top_post(thickness, axis, ridge, funnel, tol);
     translate([-spacing/2-thickness, 0, 0]) _top_post(thickness, axis, ridge, funnel, tol);
 }
 
-module latch_tongue(length=20, width=10, thickness=3, axis=2.5, ridge=.5, tol=.2) {
-    overlap = ridge;
+module latch_tongue(length=20, width=10, thickness=3, axis=2.5, ridge=.7, tol=.2) {
+    overlap = ridge+thickness;
     translate([width+thickness, 0, thickness/2]) rotate([0, -90, 0]) cylinder(h=width+2*thickness, d=axis);
     hull() {
         translate([width-tol, 0, thickness/2]) rotate([0, -90, 0]) cylinder(h=width-tol, d=thickness);
@@ -41,7 +41,7 @@ module latch_tongue(length=20, width=10, thickness=3, axis=2.5, ridge=.5, tol=.2
     }
 }
 
-module latch_catch(width=10, thickness=3, axis=2.5, ridge=.5, tol=.2) {
+module latch_catch(width=10, thickness=3, axis=2.5, ridge=.7, tol=.2) {
     overlap = ridge;
     translate([-width/2, 0, 0]) cube([width-tol, thickness, (thickness+ridge)/2+overlap]);
     translate([width/2-tol, 0, thickness/2+overlap]) rotate([0, -90, 0]) cylinder(h=width-tol, d=ridge);
diff --git a/latch.stl b/latch.stl
index 462f7a6..c1f892d 100644
Binary files a/latch.stl and b/latch.stl differ