diff --git a/web/js/kinematics.js b/web/js/kinematics.js
index 2e921e3..f8f914e 100644
--- a/web/js/kinematics.js
+++ b/web/js/kinematics.js
@@ -69,7 +69,7 @@ const LIMITS = {
   //   (can never cross to the right side of the box mid-point).
   ELBOW_BOX_X_INNER: 5,   // ← TUNE: inner X margin from centre for each elbow
   ELBOW_BOX_Y_MAX: 50,  // ← TUNE: Y below which elbow crossing is forbidden
-  ELBOW_MIN_Y: 0,       // ← TUNE: Y below which the elbow hits the bottom housing/desk
+  ELBOW_MIN_Y: -20,       // ← TUNE: Y below which the elbow hits the bottom housing/desk
 };
 
 // ── Letter / number position lookup table ────────────────────────