diff --git a/README.md b/README.md
index 7007ae3..9a75089 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,10 @@ __python > 3 (for python2 use branch py2)__
 * Shifting
 * Helical
 * Double Helical
-* Undercut
+* Undercut  
+
+![involute-gear](examples/involute-double-helical-gear.png)
+
 
 ### Involute Rack
 
diff --git a/examples/involute-double-helical-gear.png b/examples/involute-double-helical-gear.png
new file mode 100644
index 0000000..73c722d
Binary files /dev/null and b/examples/involute-double-helical-gear.png differ
diff --git a/pygears/_functions.py b/pygears/_functions.py
index 2537156..9310a16 100644
--- a/pygears/_functions.py
+++ b/pygears/_functions.py
@@ -128,7 +128,7 @@ def trimfunc(l1, l2):
                     l2 == [l2[0]]
                 else:
                     l2 = l2[jk::-1]
-                return(array([vstack([l1, [s]]), vstack([[s], l2])]))
+                return([vstack([l1, [s]]), vstack([[s], l2])])
             j0 = j
             jk += 1
         i0 = i