diff --git a/.vscode/settings.json b/.vscode/settings.json
index da429d1252..714c508189 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -33,7 +33,6 @@
   "python.testing.pytestEnabled": true,
   "python.testing.autoTestDiscoverOnSaveEnabled": true,
   "editor.rulers": [100],
-  "editor.formatOnSave": true,
   "files.exclude": {
     "**/__pycache__": true
   },
diff --git a/docs/user_guide/rpi.md b/docs/user_guide/rpi.md
index 970c730856..070be87be2 100644
--- a/docs/user_guide/rpi.md
+++ b/docs/user_guide/rpi.md
@@ -21,6 +21,10 @@ You can use PLR on any operating system, but Raspberry Pis can be a good choice
   ```
   SUBSYSTEM=="usb", MODE="0666"
   ```
+- Reload the udev rules with
+  ```bash
+  sudo udevadm control --reload-rules && sudo udevadm trigger
+  ```
 
 ```{warning}
 This adds permissions to all USB devices. This is useful when you control the device and don't want to worry when plugging in new devices, but it could be a security risk if the machine is shared with untrusted users. See [udev documentation](https://www.kernel.org/pub/linux/utils/kernel/hotplug/udev/udev.html) for more granular control.
diff --git a/pylabrobot/resources/carrier.py b/pylabrobot/resources/carrier.py
index 3f88a70a85..d58940e85a 100644
--- a/pylabrobot/resources/carrier.py
+++ b/pylabrobot/resources/carrier.py
@@ -191,6 +191,8 @@ def assign_child_resource(
         "PlateHolder can only store Plate, PlateAdapter or ResourceStack "
         + f"resources, not {type(resource)}"
       )
+    if isinstance(resource, Plate) and resource.plate_type != "skirted":
+      raise ValueError("PlateHolder can only store plates that are skirted")
     return super().assign_child_resource(resource, location, reassign)
 
   def _get_sinking_depth(self, resource: Resource) -> Coordinate:
diff --git a/pylabrobot/resources/hamilton/hamilton_deck_tests.py b/pylabrobot/resources/hamilton/hamilton_deck_tests.py
index 7270883bca..93d7c9199e 100644
--- a/pylabrobot/resources/hamilton/hamilton_deck_tests.py
+++ b/pylabrobot/resources/hamilton/hamilton_deck_tests.py
@@ -63,7 +63,7 @@ def test_summary(self):
           │   ├── <empty>
           │
     (31)  ├── teaching_carrier          Resource       (775.000, 051.800, 100.000)
-          │   ├── teaching_tip_rack     TipRack        (780.900, 452.100, 100.000)
+          │   ├── teaching_tip_rack     TipRack        (780.900, 461.100, 100.000)
           │
     (32)  ├── trash                     Trash          (800.000, 190.600, 137.100)
     """[1:]
diff --git a/pylabrobot/resources/hamilton/hamilton_decks.py b/pylabrobot/resources/hamilton/hamilton_decks.py
index 963d8bb702..788fc84484 100644
--- a/pylabrobot/resources/hamilton/hamilton_decks.py
+++ b/pylabrobot/resources/hamilton/hamilton_decks.py
@@ -308,8 +308,11 @@ def print_resource_line(resource: Resource, depth=0) -> str:
       r_summary += resource.__class__.__name__.ljust(type_column_length)
 
       # Print resource location
-      location = resource.get_absolute_location()
-      r_summary += str(location).ljust(location_column_length)
+      try:
+        location = str(resource.get_absolute_location())
+      except NoLocationError:
+        location = "Undefined"
+      r_summary += location.ljust(location_column_length)
 
       return r_summary
 
@@ -421,12 +424,12 @@ def __init__(
         size_x=9 * 8,
         size_y=9,
         size_z=50.4,
-        ordered_items={f"A{i}": tip_spots[i] for i in range(8)},
+        ordered_items={f"{letter}1": tip_spots[idx] for idx, letter in enumerate("HGFEDCBA")},
         with_tips=True,
         model="hamilton_teaching_tip_rack",
       )
       teaching_carrier.assign_child_resource(
-        teaching_tip_rack, location=Coordinate(x=5.9, y=400.3, z=0)
+        teaching_tip_rack, location=Coordinate(x=5.9, y=409.3, z=0)
       )
       self.assign_child_resource(
         teaching_carrier,