diff --git a/freecad/gears/commands.py b/freecad/gears/commands.py
index d492aca..99744dd 100644
--- a/freecad/gears/commands.py
+++ b/freecad/gears/commands.py
@@ -23,7 +23,7 @@ import os
 import FreeCAD
 import FreeCADGui as Gui
 from .features import ViewProviderGear, InvoluteGear, InvoluteGearRack
-from .features import CycloideGear, BevelGear, CrownGear, WormGear, TimingGear, LaternGear
+from .features import CycloideGear, BevelGear, CrownGear, WormGear, TimingGear, LanternGear
 
 
 class BaseCommand(object):
@@ -125,9 +125,9 @@ class CreateTimingGear(BaseCommand):
     MenuText = 'Timing gear'
     ToolTip = 'Create a Timing gear'
 
-class CreateLaternGear(BaseCommand):
-    NAME = "laterngear"
-    GEAR_FUNCTION = LaternGear
-    Pixmap = os.path.join(BaseCommand.ICONDIR, 'laterngear.svg')
-    MenuText = 'Latern gear'
-    ToolTip = 'Create a Latern gear'
+class CreateLanternGear(BaseCommand):
+    NAME = "lanterngear"
+    GEAR_FUNCTION = LanternGear
+    Pixmap = os.path.join(BaseCommand.ICONDIR, 'lanterngear.svg')
+    MenuText = 'Lantern gear'
+    ToolTip = 'Create a Lantern gear'
diff --git a/freecad/gears/features.py b/freecad/gears/features.py
index 28e5fc9..749692a 100644
--- a/freecad/gears/features.py
+++ b/freecad/gears/features.py
@@ -847,7 +847,7 @@ class TimingGear(object):
             fp.Shape = Part.Face(wi).extrude(App.Vector(0, 0, fp.height))
 
 
-class LaternGear(object):
+class LanternGear(object):
     def __init__(self, obj):
         obj.addProperty("App::PropertyInteger",
                         "teeth", "gear_parameter", "number of teeth")
@@ -859,7 +859,8 @@ class LaternGear(object):
             "App::PropertyLength", "height", "gear_parameter", "height")
         obj.addProperty("App::PropertyInteger",
                         "num_profiles", "accuracy", "number of profiles used for loft")
-        obj.teeth = 15
+        obj.addProperty(
+            "App::PropertyFloat", "head", "gear_parameter", "head * module = additional length of head")
 
         obj.teeth = 15
         obj.module = '1. mm'
@@ -876,7 +877,7 @@ class LaternGear(object):
         teeth = fp.teeth
         r_r = fp.bolt_radius.Value
         r_0 = m * teeth / 2
-        r_max = r_r / 2 + r_0
+        r_max = r_0 + r_r + fp.head * m
 
         print("r_r: {}".format(r_r))
         print("r_max: {}".format(r_max))
@@ -895,10 +896,6 @@ class LaternGear(object):
             App.Console.Warning("scipy not available. Can't compute numerical root. Leads to a wrong bolt-radius")
             phi_min = r_r / r_0
 
-    
-        print(phi_min)
-        print(r_r / r_0)
-        print(find_phi_min(phi_min))
         # phi_min = 0 # r_r / r_0
         phi = np.linspace(phi_min, phi_max, fp.num_profiles)
         x = r_0 * (np.cos(phi) + phi * np.sin(phi)) - r_r * np.sin(phi)
diff --git a/freecad/gears/icons/laterngear.svg b/freecad/gears/icons/lanterngear.svg
similarity index 100%
rename from freecad/gears/icons/laterngear.svg
rename to freecad/gears/icons/lanterngear.svg
diff --git a/freecad/gears/init_gui.py b/freecad/gears/init_gui.py
index 5b64b3b..8e7f967 100644
--- a/freecad/gears/init_gui.py
+++ b/freecad/gears/init_gui.py
@@ -46,7 +46,7 @@ class GearWorkbench(Workbench):
         "CreateCrownGear",
         "CreateWormGear",
         "CreateTimingGear",
-        "CreateLaternGear"]
+        "CreateLanternGear"]
 
     def GetClassName(self):
         return "Gui::PythonWorkbench"
@@ -54,7 +54,7 @@ class GearWorkbench(Workbench):
     def Initialize(self):
         from .commands import CreateCycloideGear, CreateInvoluteGear
         from .commands import CreateBevelGear, CreateInvoluteRack, CreateCrownGear
-        from .commands import CreateWormGear, CreateTimingGear, CreateLaternGear
+        from .commands import CreateWormGear, CreateTimingGear, CreateLanternGear
         self.appendToolbar("Gear", self.commands)
         self.appendMenu("Gear", self.commands)
         # Gui.addIconPath(App.getHomePath()+"Mod/gear/icons/")
@@ -65,7 +65,7 @@ class GearWorkbench(Workbench):
         Gui.addCommand('CreateCrownGear', CreateCrownGear())
         Gui.addCommand('CreateWormGear', CreateWormGear())
         Gui.addCommand('CreateTimingGear', CreateTimingGear())
-        Gui.addCommand('CreateLaternGear', CreateLaternGear())
+        Gui.addCommand('CreateLanternGear', CreateLanternGear())
 
     def Activated(self):
         pass