diff --git a/ophyd_devices/__init__.py b/ophyd_devices/__init__.py
index 22494ff..98c8659 100644
--- a/ophyd_devices/__init__.py
+++ b/ophyd_devices/__init__.py
@@ -3,6 +3,13 @@ from .epics import *
 from .galil.galil_ophyd import GalilMotor
 from .npoint.npoint import NPointAxis
 from .rt_lamni import RtLamniMotor
-from .sim.sim import SynAxisMonitor, SynAxisOPAAS, SynFlyer, SynSignalRO, SynSLSDetector
+from .sim.sim import (
+    SynAxisMonitor,
+    SynAxisOPAAS,
+    SynDeviceOPAAS,
+    SynFlyer,
+    SynSignalRO,
+    SynSLSDetector,
+)
 from .sls_devices.sls_devices import SLSInfo, SLSOperatorMessages
 from .smaract.smaract_ophyd import SmaractMotor
diff --git a/ophyd_devices/sim/sim.py b/ophyd_devices/sim/sim.py
index e870373..440e99f 100644
--- a/ophyd_devices/sim/sim.py
+++ b/ophyd_devices/sim/sim.py
@@ -624,6 +624,7 @@ class SynAxisOPAAS(Device, PositionerBase):
         else:
             update_state(value)
             self._done_moving()
+            st.set_finished()
         return st
 
     def stop(self, *, success=False):
@@ -638,6 +639,16 @@ class SynAxisOPAAS(Device, PositionerBase):
         return "mm"
 
 
+class SynDeviceSubOPAAS(Device):
+    zsub = Cpt(SynAxisOPAAS, name="zsub")
+
+
+class SynDeviceOPAAS(Device):
+    x = Cpt(SynAxisOPAAS, name="x")
+    y = Cpt(SynAxisOPAAS, name="y")
+    z = Cpt(SynDeviceSubOPAAS, name="z")
+
+
 if __name__ == "__main__":
     det = SynSLSDetector(name="moench")
     det.trigger()