diff --git a/eos/effectHandlerHelpers.py b/eos/effectHandlerHelpers.py
index 42efc7cc4..63e8a371a 100644
--- a/eos/effectHandlerHelpers.py
+++ b/eos/effectHandlerHelpers.py
@@ -161,20 +161,27 @@ class HandledModuleList(HandledList):
 
     def replaceRackPosition(self, rackPosition, mod):
         listPositions = []
-        for currMod in self:
+        for currPos in range(len(self)):
+            currMod = self[currPos]
             if currMod.slot == mod.slot:
-                listPositions.append(currMod.position)
+                listPositions.append(currPos)
         listPositions.sort()
         try:
             modListPosition = listPositions[rackPosition]
         except IndexError:
             self.appendIgnoreEmpty(mod)
         else:
-            self.__toDummy(modListPosition)
-            if not mod.isEmpty:
+            oldMod = self[modListPosition]
+            if mod.isEmpty:
+                self.__toDummy(modListPosition)
+            else:
                 self.__toModule(modListPosition, mod)
+                # If new module cannot be appended, restore old state
                 if mod.isInvalid:
-                    self.__toDummy(modListPosition)
+                    if oldMod.isEmpty:
+                        self.__toDummy(modListPosition)
+                    else:
+                        self.__toModule(modListPosition, oldMod)
                     raise HandledListActionError(mod)
 
     def insert(self, idx, mod):
@@ -192,7 +199,6 @@ class HandledModuleList(HandledList):
     def remove(self, mod):
         HandledList.remove(self, mod)
         oldPos = mod.position
-
         mod.position = None
         for i in range(oldPos, len(self)):
             self[i].position -= 1
@@ -214,14 +220,6 @@ class HandledModuleList(HandledList):
         self[index] = mod
         oldMod.position = None
 
-    @deprecated
-    def freeSlot(self, slot):
-        for i in range(len(self)):
-            mod = self[i]
-            if mod.getModifiedItemAttr("subSystemSlot") == slot:
-                self.__toDummy(i)
-                break
-
 
 class HandledDroneCargoList(HandledList):
 
diff --git a/service/fitDeprecated.py b/service/fitDeprecated.py
index fee1783e7..dd57b94c8 100644
--- a/service/fitDeprecated.py
+++ b/service/fitDeprecated.py
@@ -283,39 +283,6 @@ class FitDeprecated(object):
         eos.db.commit()
         self.recalc(fit)
 
-    @deprecated
-    def appendModule(self, fitID, itemID):
-        pyfalog.debug("Appending module for fit ({0}) using item: {1}", fitID, itemID)
-        fit = eos.db.getFit(fitID)
-        item = eos.db.getItem(itemID, eager=("attributes", "group.category"))
-        try:
-            m = es_Module(item)
-        except ValueError:
-            pyfalog.warning("Invalid item: {0}", itemID)
-            return False
-
-        if m.item.category.name == "Subsystem":
-            fit.modules.freeSlot(m.getModifiedItemAttr("subSystemSlot"))
-
-        if m.fits(fit):
-            m.owner = fit
-            numSlots = len(fit.modules)
-            fit.modules.append(m)
-            if m.isValidState(FittingModuleState.ACTIVE):
-                m.state = FittingModuleState.ACTIVE
-
-            # As some items may affect state-limiting attributes of the ship, calculate new attributes first
-            self.recalc(fit)
-            # Then, check states of all modules and change where needed. This will recalc if needed
-            self.checkStates(fit, m)
-
-            fit.fill()
-            eos.db.commit()
-
-            return numSlots != len(fit.modules), m.modPosition
-        else:
-            return None, None
-
     @deprecated
     def removeModule(self, fitID, positions):
         """Removes modules based on a number of positions."""