diff --git a/notebook_nueva/battery_holder.py b/notebook_nueva/battery_holder.py
index 9145818..3dd7112 100644
--- a/notebook_nueva/battery_holder.py
+++ b/notebook_nueva/battery_holder.py
@@ -1,12 +1,8 @@
 import cadquery2 as cq
 from cadquery2 import exporters
 
-cpu_stand_positions = [(0, 0), (58, 0), (58, 48), (0, 48)] 
+cpu_stand_positions = [(0, 0), (58, 0), (58, 48), (0, 48)]
 
-lower_stands = (
-    cq.Sketch().push(cpu_stand_positions).circle(3, mode="a")
-)
+lower_stands = cq.Sketch().push(cpu_stand_positions).circle(3, mode="a")
 
-higher_stands = (
-    cq.Sketch().push(cpu_stand_positions).circle(2.65 / 2, mode="a")
-)
\ No newline at end of file
+higher_stands = cq.Sketch().push(cpu_stand_positions).circle(2.65 / 2, mode="a")
diff --git a/notebook_nueva/cpu_holder.py b/notebook_nueva/cpu_holder.py
index 4148aa9..fa31c19 100644
--- a/notebook_nueva/cpu_holder.py
+++ b/notebook_nueva/cpu_holder.py
@@ -1,12 +1,8 @@
 import cadquery2 as cq
 from cadquery2 import exporters
 
-cpu_stand_positions = [(0, 0), (23, 0), (23, 58), (0, 58)] 
+cpu_stand_positions = [(0, 0), (23, 0), (23, 58), (0, 58)]
 
-lower_stands = (
-    cq.Sketch().push(cpu_stand_positions).circle(3, mode="a")
-)
+lower_stands = cq.Sketch().push(cpu_stand_positions).circle(3, mode="a")
 
-higher_stands = (
-    cq.Sketch().push(cpu_stand_positions).circle(2.65 / 2, mode="a")
-)
\ No newline at end of file
+higher_stands = cq.Sketch().push(cpu_stand_positions).circle(2.65 / 2, mode="a")
diff --git a/notebook_nueva/modelo.py b/notebook_nueva/modelo.py
index affbc98..6d4ab1c 100644
--- a/notebook_nueva/modelo.py
+++ b/notebook_nueva/modelo.py
@@ -104,7 +104,7 @@ def model():
         # USB inlet
         .faces(">X")
         .workplane(centerOption="CenterOfBoundBox")
-        # The position is arbitrary, based on the components 
+        # The position is arbitrary, based on the components
         # available, keyboard height, cable length, etc.
         .center(-height / 2 + shell_t + 60, -5)
         .placeSketch(usb_in)
@@ -146,31 +146,31 @@ def model():
         # 13 is 20-7 (screw thread length - threaded insert depth)
         .cutBlind(thickness - 13)
         # CPU Stands (lower)
-        # The -65, -40 is the position of the CPU, 
+        # The -65, -40 is the position of the CPU,
         # and should be a parameter (TODO)
         .workplaneFromTagged("mid_height")
         .workplane(offset=-thickness / 2, centerOption="CenterOfBoundBox")
-        .center (width/2 - 40, height/2 - 65)
+        .center(width / 2 - 40, height / 2 - 65)
         .placeSketch(cpu_holder.lower_stands)
         .extrude(7)
         # CPU Stands (higher)
         .workplaneFromTagged("mid_height")
         .workplane(offset=-thickness / 2, centerOption="CenterOfBoundBox")
-        .center (width/2 - 40, height/2 - 65)
+        .center(width / 2 - 40, height / 2 - 65)
         .placeSketch(cpu_holder.higher_stands)
         .extrude(11)
         # Battery Stands (lower)
-        # The +18, -55 is the position of the battery system, 
+        # The +18, -55 is the position of the battery system,
         # and should be a parameter (TODO)
         .workplaneFromTagged("mid_height")
         .workplane(offset=-thickness / 2, centerOption="CenterOfBoundBox")
-        .center (-width/2 + 18, height/2 - 55)
+        .center(-width / 2 + 18, height / 2 - 55)
         .placeSketch(battery_holder.lower_stands)
         .extrude(shell_t + 5)
         # Battery Stands (higher)
         .workplaneFromTagged("mid_height")
         .workplane(offset=-thickness / 2, centerOption="CenterOfBoundBox")
-        .center (-width/2 + 18, height/2 - 55)
+        .center(-width / 2 + 18, height / 2 - 55)
         .placeSketch(battery_holder.higher_stands)
         .extrude(shell_t + 8)
     )