diff --git a/example.py b/example.py
index ce3ed26..abee367 100644
--- a/example.py
+++ b/example.py
@@ -1,5 +1,9 @@
+import time
 from xtendr.xtendrsystem import XtendRSystem
 
+def my_callback():
+    print("'example_plugin is finished pre-loading")
+    
 if __name__ == "__main__":
     """Example usage of the PluginSystem.
     
@@ -15,7 +19,8 @@ if __name__ == "__main__":
     Detached plugin 'example_plugin'.
     """
     system = XtendRSystem()
-    system.attach("example_plugin")  # Assuming 'example_plugin/plugin_info.json' exists
+    system.attach("example_plugin", my_callback)  # Assuming 'example_plugin/plugin_info.json' exists
+    time.sleep(6)
     system.run("example_plugin", test="Hello!")
     system.stop("example_plugin")
     system.run("example_plugin", 25)
diff --git a/plugins/example_plugin/example_plugin.py b/plugins/example_plugin/example_plugin.py
index 27fb2a4..5524d68 100644
--- a/plugins/example_plugin/example_plugin.py
+++ b/plugins/example_plugin/example_plugin.py
@@ -1,4 +1,5 @@
 import threading
+import time
 from xtendr.xtendrbase import XtendRBase
 
 class ExamplePlugin(XtendRBase):
@@ -14,9 +15,6 @@ class ExamplePlugin(XtendRBase):
     >>> plugin.stop()
     ExamplePlugin has stopped!
     """
-    self.pre_load_done = threading.Event()
-    self.use_pre_load:bool = False #Indicate that pre-loading isn't neccessary
-
     def run(self, *args, **kwargs):
         arglen = len(args)
         keylen = len(kwargs)
@@ -36,5 +34,6 @@ class ExamplePlugin(XtendRBase):
     def stop(self):
         print("ExamplePlugin has stopped!")
 
-    def pre_load(self):
-        pass
+    def pre_load(self, callback):
+        time.sleep(5) # Indicate long running pre-load.
+        callback()
diff --git a/xtendr/xtendrbase.py b/xtendr/xtendrbase.py
index 21ee84d..3a85940 100644
--- a/xtendr/xtendrbase.py
+++ b/xtendr/xtendrbase.py
@@ -25,6 +25,6 @@ class XtendRBase(ABC):
         pass
 
     @abstractmethod
-    def pre_load(self):
+    def pre_load(self, *args):
         pass
         
\ No newline at end of file
diff --git a/xtendr/xtendrsystem.py b/xtendr/xtendrsystem.py
index 6effe80..9232dc7 100644
--- a/xtendr/xtendrsystem.py
+++ b/xtendr/xtendrsystem.py
@@ -5,7 +5,7 @@ import json
 import threading
 from xtendr.xtendrbase import XtendRBase
 
-__version__ = "0.1.3"
+__version__ = "0.3.0"
 
 class XtendRSystem:
     """Plugin system to manage plugins.
@@ -29,7 +29,7 @@ class XtendRSystem:
     def version(self) -> str:
         return "XtendR v" + __version__
     
-    def attach(self, name: str) -> None:
+    def attach(self, name: str, callback) -> None:
         """Dynamically load a plugin from its folder."""
         if name in self.plugins:
             print(f"Plugin '{name}' is already attached.")
@@ -68,15 +68,12 @@ class XtendRSystem:
                     'autorun': False
                 }
                 print(f"Attached plugin '{name}'.")
+                print(f"Running pre-load on '{name}'.")
+                thread = threading.Thread(target=self.plugins[name].pre_load(), args=(callback,))
+                thread.start()
         except (ModuleNotFoundError, json.JSONDecodeError, AttributeError) as e:
             print(f"Failed to attach plugin '{name}': {e}")
     
-    def _pre_load(self, name: str):
-        """Pre-load data if needed"""
-        if name in plugins:
-            if self.plugins[name].use_pre_load: # Is pre-loading neccessary?
-                threading.Thread(target=self.plugins[name].pre_load()).start()
-
     def run(self, name: str, *args, **kwargs):
         """Run the plugin's 'run' method if available."""
         if name in self.plugins: