diff --git a/box.scad b/box.scad
index 0eb27d0..07d37b6 100644
--- a/box.scad
+++ b/box.scad
@@ -578,7 +578,7 @@ if (PART == "new_joiner") {
 if (PART == "grid_mount") {
 	difference() {
 		union() {
-			fwd(19.799/2)cuboid([48,6+19.799,2], fillet=1, align=V_TOP);
+			fwd(19.799/2-1)cuboid([48,3+19.799,4], fillet=1, align=V_TOP);
 			up(1)fwd(3.4+19.799)xrot(-45) cuboid([10+84,6,25], fillet=1, align=V_TOP+V_BACK);
 		}