diff --git a/tangostationcontrol/tangostationcontrol/beam/test_delays.py b/tangostationcontrol/tangostationcontrol/beam/test_delays.py
index 986ac2bc877c096c37bef2b284cc3e816d682843..32eee0838224abfe16ad47b11f3bd0c9af0f9e93 100644
--- a/tangostationcontrol/tangostationcontrol/beam/test_delays.py
+++ b/tangostationcontrol/tangostationcontrol/beam/test_delays.py
@@ -1,4 +1,5 @@
 from delays import *
+import pprint
 
 if __name__ == '__main__':
     # # create a frame tied to the reference position
@@ -19,5 +20,47 @@ if __name__ == '__main__':
     delays = d.convert(direction, antenna_itrf)
 
     # print the delays
-    import pprint
-    pprint.pprint(delays)
+    # pprint.pprint(delays)
+
+
+    #test changing the time
+
+    print(f"Changing timestamp test\nBase parametres: Direction: {direction}, position: {antenna_itrf}")
+    for i in range(10):
+        # # set the timestamp to solve for
+        timestamp = datetime.datetime(2021,1,1,0,i,5)
+        d.set_measure_time(timestamp)
+
+        delays = d.convert(direction, antenna_itrf)
+
+        # print the delays
+        print(f"Timestamp: {timestamp}:   {delays}")
+
+
+    # reset time
+    timestamp = datetime.datetime(2021, 1, 1, 0, 0, 5)
+    d.set_measure_time(timestamp)
+
+
+    #test changing the antenna position
+    print(f"Changing Antenna position test.\nBase parametres: Time: {timestamp} Direction: {direction}")
+    for i in range(10):
+        antenna_itrf = [[3826577.066 + i, 461022.948, 5064892.786]]  # CS002LBA, in ITRF2005 epoch 2012.5
+
+        delays = d.convert(direction, antenna_itrf)
+
+        # print the delays
+        print(f"Antenna position: {antenna_itrf}:   {delays}")
+
+    # test changing the direction
+
+    antenna_itrf = [[3826923.546, 460915.441, 5064643.489]]  # CS001LBA, in ITRF2005 epoch 2012.5
+    print(f"Changing direction test.\nBase parametres: Time: {timestamp} , position: {antenna_itrf}")
+
+    for i in range(10):
+        direction = "J2000", f"{i}deg", "0deg"
+
+        delays = d.convert(direction, antenna_itrf)
+
+        # print the delays
+        print(f"Direction: {direction}:  {delays}")
diff --git a/tangostationcontrol/tangostationcontrol/devices/abstract_device.py b/tangostationcontrol/tangostationcontrol/devices/abstract_device.py
index 8250e4e481dc9d27ec88654b6fef777d0e9bc4e4..32b82052d8a55e8928deee6324b4616212f21a9a 100644
--- a/tangostationcontrol/tangostationcontrol/devices/abstract_device.py
+++ b/tangostationcontrol/tangostationcontrol/devices/abstract_device.py
@@ -19,10 +19,15 @@ from tango.server import DeviceMeta
 logger = logging.getLogger()
 
 
-class AbstractDeviceMetas(DeviceMeta, ABCMeta):
+# TODO(Corne): Fix combining metaclasses by iterating over their variables and
+#              methods. https://support.astron.nl/jira/browse/L2SS-551
+# class AbstractDeviceMetas(DeviceMeta, ABCMeta):
+class AbstractDeviceMetas(DeviceMeta):
     """Collects meta classes to allow lofar_device to be both a Device and an ABC. """
 
     def __new__(mcs, name, bases, namespace, **kwargs):
-        cls = ABCMeta.__new__(mcs, name, bases, namespace, **kwargs)
-        cls = DeviceMeta.__new__(type(cls), name, bases, namespace)
+        cls = DeviceMeta.__new__(mcs, name, bases, namespace, **kwargs)
+        # temp_cls = ABCMeta.__new__(mcs, name, bases, namespace)
+        # setattr(cls, '__abstractmethods__', temp_cls.__abstractmethods__)
+        # setattr(cls, '_abc_impl', temp_cls._abc_impl)
         return cls
diff --git a/tangostationcontrol/tangostationcontrol/devices/sdp/statistics.py b/tangostationcontrol/tangostationcontrol/devices/sdp/statistics.py
index 4b03f2db7848cf37d1b2d8ccacfcf0ac81e928cc..3bf6d8cc4f1881d6f15692b43d8367c6aa769769 100644
--- a/tangostationcontrol/tangostationcontrol/devices/sdp/statistics.py
+++ b/tangostationcontrol/tangostationcontrol/devices/sdp/statistics.py
@@ -11,7 +11,7 @@
 
 """
 
-from abc import ABCMeta, abstractmethod
+from abc import abstractmethod
 
 # PyTango imports
 from tango.server import device_property, attribute
@@ -33,7 +33,9 @@ import numpy
 
 __all__ = ["Statistics"]
 
-class Statistics(opcua_device, metaclass=ABCMeta):
+# TODO(Corne): Make Statistics use ABCMeta again when L2SS-551 is fixed
+#              https://support.astron.nl/jira/browse/L2SS-551
+class Statistics(opcua_device):
 
     # In derived classes, set this to a subclass of StatisticsCollector
     @property
diff --git a/tangostationcontrol/tangostationcontrol/integration_test/devices/base.py b/tangostationcontrol/tangostationcontrol/integration_test/devices/base.py
index ef4854a8241aaee7e6099ae7d417d7b94acfa21e..3e6fa389a1739acce868fd098b91357979768d7f 100644
--- a/tangostationcontrol/tangostationcontrol/integration_test/devices/base.py
+++ b/tangostationcontrol/tangostationcontrol/integration_test/devices/base.py
@@ -12,6 +12,7 @@ import unittest
 
 from tango._tango import DevState
 
+from tangostationcontrol.devices.opcua_device import opcua_device
 from tangostationcontrol.integration_test.device_proxy import TestDeviceProxy
 from tangostationcontrol.integration_test import base
 
@@ -55,6 +56,12 @@ class AbstractTestBases:
 
             self.assertEqual(DevState.STANDBY, self.proxy.state())
 
+        def test_device_missing_attributes(self):
+            """Test if any attributes are missing from opcua devices"""
+
+            if isinstance(self.proxy, opcua_device):
+                self.self.assertListEqual([], self.proxy.opcua_missing_attributes_R)
+
         def test_device_on(self):
             """Test if we can transition to on"""
 
diff --git a/tangostationcontrol/tangostationcontrol/test/devices/test_abstract_device.py b/tangostationcontrol/tangostationcontrol/test/devices/test_abstract_device.py
index 469ea19fa970cf48c2de9c4c6b5648bd7b756040..badfadade01521aeb104f77a86f6b42df2f26927 100644
--- a/tangostationcontrol/tangostationcontrol/test/devices/test_abstract_device.py
+++ b/tangostationcontrol/tangostationcontrol/test/devices/test_abstract_device.py
@@ -86,4 +86,9 @@ class TestAbstractDevice(base.TestCase):
         # the expected error.
         self.assertRaises(TypeError, self.AbstractExample)
 
+    @mock.patch.object(server, 'get_worker')
+    @mock.patch.object(server, 'LatestDeviceImpl')
+    def test_isinstance(self, m_worker, m_implement):
+        m_device = self.TestHardwareDevice(mock.Mock(), mock.Mock())
 
+        self.assertFalse(isinstance(m_device, AbstractDeviceMetas))