diff --git a/pylabrobot/liquid_handling/backends/hamilton/STAR.py b/pylabrobot/liquid_handling/backends/hamilton/STAR.py
index 0246aea188..4f83013826 100644
--- a/pylabrobot/liquid_handling/backends/hamilton/STAR.py
+++ b/pylabrobot/liquid_handling/backends/hamilton/STAR.py
@@ -4069,7 +4069,7 @@ async def get_core(self, p1: int, p2: int):
     if deck_size == STARLET_SIZE_X:
       xs = "07975" # 1360-797.5 = 562.5
     elif deck_size == STAR_SIZE_X:
-      xs = "13375" # 1900-1337.5 = 562.5
+      xs = "13385" # 1900-1337.5 = 562.5, plus a manual adjustment of + 10
     else:
       raise ValueError(f"Deck size {deck_size} not supported")
 
@@ -4078,8 +4078,8 @@ async def get_core(self, p1: int, p2: int):
       command="ZT",
       xs=xs,
       xd="0",
-      ya="1250",
-      yb="1070",
+      ya="1240",
+      yb="1065",
       pa=f"{p1:02}",
       pb=f"{p2:02}",
       tp="2350",
@@ -4098,7 +4098,7 @@ async def put_core(self):
     if deck_size == STARLET_SIZE_X:
       xs = "07975"
     elif deck_size == STAR_SIZE_X:
-      xs = "13375"
+      xs = "13385"
     else:
       raise ValueError(f"Deck size {deck_size} not supported")
     command_output = await self.send_command(
@@ -4106,8 +4106,8 @@ async def put_core(self):
       command="ZS",
       xs=xs,
       xd="0",
-      ya="1250",
-      yb="1070",
+      ya="1240",
+      yb="1065",
       tp="2150",
       tz="2050",
       th=int(self._traversal_height * 10),
diff --git a/pylabrobot/liquid_handling/backends/hamilton/STAR_tests.py b/pylabrobot/liquid_handling/backends/hamilton/STAR_tests.py
index 8c563f754a..6078a9e65d 100644
--- a/pylabrobot/liquid_handling/backends/hamilton/STAR_tests.py
+++ b/pylabrobot/liquid_handling/backends/hamilton/STAR_tests.py
@@ -765,14 +765,14 @@ def test_serialize(self):
   async def test_move_core(self):
     await self.lh.move_plate(self.plate, self.plt_car[1], pickup_distance_from_top=13,
                              use_arm="core")
-    self._assert_command_sent_once("C0ZTid0020xs07975xd0ya1250yb1070pa07pb08tp2350tz2250th2450tt14",
+    self._assert_command_sent_once("C0ZTid0020xs07975xd0ya1240yb1065pa07pb08tp2350tz2250th2450tt14",
                                    "xs#####xd#ya####yb####pa##pb##tp####tz####th####tt##")
     self._assert_command_sent_once("C0ZPid0021xs03475xd0yj1145yv0050zj1876zy0500yo0890yg0830yw15"
                                    "th2450te2450",
                                    "xs#####xd#yj####yv####zj####zy####yo####yg####yw##th####te####")
     self._assert_command_sent_once("C0ZRid0022xs03475xd0yj2105zj1876zi000zy0500yo0890th2450te2450",
                                    "xs#####xd#yj####zj####zi###zy####yo####th####te####")
-    self._assert_command_sent_once("C0ZSid0023xs07975xd0ya1250yb1070tp2150tz2050th2450te2450",
+    self._assert_command_sent_once("C0ZSid0023xs07975xd0ya1240yb1065tp2150tz2050th2450te2450",
                                     "xs#####xd#ya####yb####tp####tz####th####te####")
 
   async def test_iswap_pick_up_resource_grip_direction_changes_plate_width(self):