diff --git a/README.md b/README.md
index 72b2e92..51c89ad 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,7 @@ Operation                   | Description
 --------------------------- | ---------------------------
   del_model <reg_ex>  | Deletes all models whose name contains the regular expression <reg_ex>.
   geo_name <name>     | Change the .geo's name to <name>.
+  swap_left_right <reg_ex> | Swap left and right bones for all models matching <reg_ex>.
   rename_model <old> <new> | Rename a model from <old> to <new>.
   rename_texture <old> <new> | Rename a texture from <old> to <new>.
   rescale_all <scale> | Rescale all vertices in all models by multiplying them all by <scale> .
diff --git a/bones.py b/bones.py
index dc702fa..f624903 100644
--- a/bones.py
+++ b/bones.py
@@ -114,9 +114,27 @@ BONES_LIST = [
     "Leg_R_Jet2",
 ]
 
+BONES_LEFT = []
+BONES_RIGHT = []
+BONES_SWAP = []
+
 BONES_LOOKUP = {}
 
 for i in range(len(BONES_LIST)):
     BONES_LOOKUP[BONES_LIST[i]] = i
     BONES_LOOKUP[BONES_LIST[i].upper()] = i
     BONES_LOOKUP[BONES_LIST[i].lower()] = i
+    if BONES_LIST[i][-1] == "L":
+        BONES_LEFT.append(BONES_LIST[i])
+    if BONES_LIST[i][-1] == "R":
+        BONES_RIGHT.append(BONES_LIST[i])
+for i in range(len(BONES_LIST)):
+    j = i
+    n = BONES_LIST[i]
+    if n in BONES_LEFT:
+        n = BONES_RIGHT[BONES_LEFT.index(n)]
+        j = BONES_LOOKUP[n]
+    elif n in BONES_RIGHT:
+        n = BONES_LEFT[BONES_RIGHT.index(n)]
+        j = BONES_LOOKUP[n]
+    BONES_SWAP.append(j)
diff --git a/geo_edit.py b/geo_edit.py
index 415a006..d1ec61d 100755
--- a/geo_edit.py
+++ b/geo_edit.py
@@ -3,6 +3,10 @@
 import sys
 import re
 from geo import Geo
+try:
+    from .bones import *
+except:
+    from bones import *
 
 
 
@@ -13,6 +17,7 @@ if len(sys.argv) < 4:
     print("Operations:")
     print("    del_model <reg_ex_filter>    Delete models with the name matching regular expression.")
     print("    geo_name <geo_name>          Rename the name of the .geo .")
+    print("    swap_left_right <reg_ex>     Swap left and right bones for all models matching the regular expression.")
     print("    rename_model <old> <new>     Rename model <old> to <new>.")
     print("    rename_texture <old> <new>   Rename texture <old> to <new>.")
     print("    rescale_all <scale>          Rescale all models by the given amount.")
@@ -101,6 +106,18 @@ while arg_i < len(sys.argv):
                 break
         if found <= 0:
             print("   **Warning!*** Set model scale failed, no model named '%s'." % (nameold.decode("utf-8"), ))
+    elif operation == "swap_left_right":
+        reg_exp_str = sys.argv[arg_i]
+        arg_i += 1
+        reg_exp = re.compile(reg_exp_str)
+        for i in range(len(geo.models) - 1, -1, -1):
+            name = geo.models[i].name.decode("utf-8")
+            if reg_exp.search(name) is not None:
+                print("Swapping left and right in: %s" % (name, ))
+                model = geo.models[i]
+                for j in range(len(model.weight_bones)):
+                    for k in range(len(model.weight_bones[j])):
+                        model.weight_bones[j][k] = BONES_SWAP[model.weight_bones[j][k]]
     else:
         print("Unknown operation: '%s'" % (operation, ))
         exit()