diff --git a/LockingGuitarTuner.scad b/LockingGuitarTuner.scad
index 586b92e..e17da24 100644
--- a/LockingGuitarTuner.scad
+++ b/LockingGuitarTuner.scad
@@ -28,7 +28,7 @@ module LockingGuitarTuner(holes=0) {
 		}
 		rotate([0, 0, 45]) translate([0,0,h-h2]) hull() {
 			cylinder(h=h2, d=d_post_cutout + tolerance);
-			translate([0, 10.5]) cylinder(h=h2, d=screw_diameter+2 + tolerance);
+			translate([0, 10.5]) cylinder(h=h2, d=screw_diameter+2.7 + tolerance);
 		}
 	}
 	module Holes() {
@@ -65,6 +65,7 @@ module LockingGuitarTuner(holes=0) {
 		t = t_base + holes;
 		Holes();
 		translate([0, 0, -t]) tuner_footprint_extrude(h=t, tolerance=0.5);
+		translate([0, 0, -t]) cylinder(h=holes+0.5, d=16+1.5);  // Locking thumbscrew
 		translate([w_tag/2, -l_tag+8-tolerance/2, -t]) cube([24, 8+tolerance, t]);
 	} else {
 		TunerPreview();