diff --git a/lib/logitech_receiver/diversion.py b/lib/logitech_receiver/diversion.py
index 5ac595dca..bacae45f4 100644
--- a/lib/logitech_receiver/diversion.py
+++ b/lib/logitech_receiver/diversion.py
@@ -511,19 +511,19 @@ def charging(f, r, d, _a):
     "mouse-noop": [],
 }
 
-# COMPONENTS = {}
 
-
-class RuleComponent:
-    def compile(self, c):
-        if isinstance(c, RuleComponent):
-            return c
-        elif isinstance(c, dict) and len(c) == 1:
-            k, v = next(iter(c.items()))
-            if k in COMPONENTS:
-                return COMPONENTS[k](v)
-        logger.warning("illegal component in rule: %s", c)
-        return Condition()
+def compile_component(c):
+    if isinstance(c, Rule) or isinstance(c, Condition) or isinstance(c, Action):
+        return c
+    elif isinstance(c, dict) and len(c) == 1:
+        k, v = next(iter(c.items()))
+        try:
+            cls = COMPONENTS[k]
+            return cls(v)
+        except KeyError:
+            pass
+    logger.warning("illegal component in rule: %s", c)
+    return FalllbackCondition()
 
 
 def _evaluate(components, feature, notification: HIDPPNotification, device, result) -> Any:
@@ -537,9 +537,9 @@ def _evaluate(components, feature, notification: HIDPPNotification, device, resu
     return res
 
 
-class Rule(RuleComponent):
+class Rule:
     def __init__(self, args, source=None, warn=True):
-        self.components = [self.compile(a) for a in args]
+        self.components = [compile_component(a) for a in args]
         self.source = source
 
     def __str__(self):
@@ -559,7 +559,7 @@ def data(self):
         return {"Rule": [c.data() for c in self.components]}
 
 
-class Condition(RuleComponent):
+class Condition:
     def __init__(self, *args):
         pass
 
@@ -577,7 +577,7 @@ def __init__(self, op, warn=True):
         if isinstance(op, list) and len(op) == 1:
             op = op[0]
         self.op = op
-        self.component = self.compile(op)
+        self.component = compile_component(op)
 
     def __str__(self):
         return "Not: " + str(self.component)
@@ -594,7 +594,7 @@ def data(self):
 
 class Or(Condition):
     def __init__(self, args, warn=True):
-        self.components = [self.compile(a) for a in args]
+        self.components = [compile_component(a) for a in args]
 
     def __str__(self):
         return "Or: [" + ", ".join(str(c) for c in self.components) + "]"
@@ -617,7 +617,7 @@ def data(self):
 
 class And(Condition):
     def __init__(self, args, warn=True):
-        self.components = [self.compile(a) for a in args]
+        self.components = [compile_component(a) for a in args]
 
     def __str__(self):
         return "And: [" + ", ".join(str(c) for c in self.components) + "]"
@@ -1145,7 +1145,7 @@ def data(self):
         return {"Host": self.host}
 
 
-class Action(RuleComponent):
+class Action:
     def __init__(self, *args):
         pass
 
diff --git a/lib/solaar/ui/diversion_rules.py b/lib/solaar/ui/diversion_rules.py
index 788eab241..af7f488ac 100644
--- a/lib/solaar/ui/diversion_rules.py
+++ b/lib/solaar/ui/diversion_rules.py
@@ -512,7 +512,7 @@ def menu_do_copy(self, _mitem: Gtk.MenuItem, m: Gtk.TreeStore, it: Gtk.TreeIter)
 
         wrapped = m[it][0]
         c = wrapped.component
-        _rule_component_clipboard = diversion.RuleComponent().compile(c.data())
+        _rule_component_clipboard = diversion.compile_component(c.data())
 
     def menu_do_cut(self, _mitem, m, it):
         global _rule_component_clipboard
@@ -533,7 +533,7 @@ def menu_do_paste(self, _mitem, m, it, below=False):
         c = _rule_component_clipboard
         _rule_component_clipboard = None
         if c:
-            _rule_component_clipboard = diversion.RuleComponent().compile(c.data())
+            _rule_component_clipboard = diversion.compile_component(c.data())
             self._menu_do_insert(_mitem, m, it, new_c=c, below=below)
             self._on_update()
 
diff --git a/lib/solaar/ui/rule_base.py b/lib/solaar/ui/rule_base.py
index 1fcc5dcd1..ee787c87b 100644
--- a/lib/solaar/ui/rule_base.py
+++ b/lib/solaar/ui/rule_base.py
@@ -13,14 +13,11 @@
 ## You should have received a copy of the GNU General Public License along
 ## with this program; if not, write to the Free Software Foundation, Inc.,
 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-import abc
 
 from contextlib import contextmanager as contextlib_contextmanager
-from typing import Any
 from typing import Callable
 
 from gi.repository import Gtk
-from logitech_receiver import diversion
 
 
 def norm(s):
@@ -49,9 +46,7 @@ def add_completion_to_entry(cls, entry, values):
             liststore.append((v,))
 
 
-class RuleComponentUI(abc.ABC):
-    CLASS = diversion.RuleComponent
-
+class RuleComponentUI:
     def __init__(self, panel, on_update: Callable = None):
         self.panel = panel
         self.widgets = {}  # widget -> coord. in grid
@@ -60,16 +55,14 @@ def __init__(self, panel, on_update: Callable = None):
         self._on_update_callback = (lambda: None) if on_update is None else on_update
         self.create_widgets()
 
-    @abc.abstractmethod
-    def create_widgets(self) -> dict:
+    def create_widgets(self):
         pass
 
     def show(self, component, editable=True):
         self._show_widgets(editable)
         self.component = component
 
-    @abc.abstractmethod
-    def collect_value(self) -> Any:
+    def collect_value(self):
         pass
 
     @contextlib_contextmanager
@@ -109,5 +102,5 @@ def _remove_panel_items(self):
         for c in self.panel.get_children():
             self.panel.remove(c)
 
-    def update_devices(self):  # noqa: B027
+    def update_devices(self):
         pass