diff --git a/scripts/addons/cam/__init__.py b/scripts/addons/cam/__init__.py
index 37dc936..bc8494b 100644
--- a/scripts/addons/cam/__init__.py
+++ b/scripts/addons/cam/__init__.py
@@ -37,7 +37,7 @@ try:
 except ImportError:
     # pip install required python stuff
     subprocess.check_call([sys.executable, "-m", "ensurepip"])
-    subprocess.check_call([sys.executable, "-m", "pip", "install", "shapely","equation","opencamlib"])
+    subprocess.check_call([sys.executable, "-m", "pip", "install", "shapely","Equation","opencamlib"])
 
 
 from bpy.app.handlers import persistent
diff --git a/scripts/addons/cam/puzzle_joinery.py b/scripts/addons/cam/puzzle_joinery.py
index 1e6eedd..674f842 100644
--- a/scripts/addons/cam/puzzle_joinery.py
+++ b/scripts/addons/cam/puzzle_joinery.py
@@ -242,7 +242,8 @@ def arc(radius, thick, angle, diameter, tolerance, amount=0, stem=1, twist=False
 
     fingers(diameter, tolerance, amount, stem=stem)
     twistf('receptacle', thick, diameter, tolerance, twist, tneck, tthick, twist_keep=twist_keep)
-
+    twistf('testing', thick, diameter, tolerance, twist, tneck, tthick, twist_keep=twist_keep)
+    print("generating arc")
     # generate arc
     bpy.ops.curve.simple(align='WORLD', location=(0, 0, 0), rotation=(0, 0, 0), Simple_Type='Segment',
                          Simple_a=radius - thick / 2,