diff --git a/generic/bson.c b/generic/bson.c
index c4735a6..7de0077 100644
--- a/generic/bson.c
+++ b/generic/bson.c
@@ -249,6 +249,40 @@ mongotcl_cmdNameObjToBson (Tcl_Interp *interp, Tcl_Obj *commandNameObj, bson **b
     return TCL_OK;
 }
 
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * mongotcl_cmdNameObjSetBson --
+ *
+ *    Take a command name and a pointer to a bson structure, find the Tcl 
+ *    command info structure, confirm it's bson, destroy the old bson
+ *    structure there and point the command to the passed-in bson
+ *    structure.
+ *
+ *----------------------------------------------------------------------
+ */
+int
+mongotcl_cmdNameObjSetBson (Tcl_Interp *interp, Tcl_Obj *commandNameObj, bson *newBson) {
+    Tcl_CmdInfo	cmdInfo;
+    mongotcl_bsonClientData *bd;
+
+    if (!Tcl_GetCommandInfo (interp, Tcl_GetString(commandNameObj), &cmdInfo)) {
+		return TCL_ERROR;
+    }
+
+    if (cmdInfo.objClientData == NULL || ((mongotcl_bsonClientData *)cmdInfo.objClientData)->bson_magic != MONGOTCL_BSON_MAGIC) {
+		Tcl_AppendResult (interp, "Error: '", Tcl_GetString (commandNameObj), "' is not a bson object", NULL);
+		return TCL_ERROR;
+    }
+
+    bd = (mongotcl_bsonClientData *)cmdInfo.objClientData;
+
+    bson_destroy(bd->bson);
+	bd->bson = newBson;
+    return TCL_OK;
+}
+
 
 /*
  *----------------------------------------------------------------------
diff --git a/generic/cursor.c b/generic/cursor.c
index 516b38e..79ca634 100644
--- a/generic/cursor.c
+++ b/generic/cursor.c
@@ -334,12 +334,16 @@ mongotcl_cursorObjectObjCmd(ClientData cData, Tcl_Interp *interp, int objc, Tcl_
 		}
 
 		case OPT_CURSOR_BSON: {
+			char *bsonCommandObject;
+
 			if (objc != 3) {
 				Tcl_WrongNumArgs (interp, 2, objv, "bsonName");
 				return TCL_ERROR;
 			}
+
+			bsonCommandObject = Tcl_GetString (objv[2]);
 	
-			return mongotcl_create_bson_command (interp, Tcl_GetString (objv[2]), mongo_cursor_bson (mc->cursor));
+			return mongotcl_cmdNameObjSetBson (interp, bsonCommandObject, mongo_cursor_bson (mc->cursor));
 		}
 
 		case OPT_CURSOR_NEXT: {
diff --git a/generic/mongotcl.h b/generic/mongotcl.h
index fe6bb0b..f14bea3 100644
--- a/generic/mongotcl.h
+++ b/generic/mongotcl.h
@@ -12,11 +12,11 @@
 
 #define MONGO_HAVE_STDINT
 
-#define MONGOTCL_BSON_MAGIC 0xf33df00d
+#define MONGOTCL_BSON_MAGIC 0xf33df007
 
-#define MONGOTCL_MONGO_MAGIC 0xf33dd00d
+#define MONGOTCL_MONGO_MAGIC 0xf33db007
 
-#define MONGOTCL_CURSOR_MAGIC 0xf33dc00c
+#define MONGOTCL_CURSOR_MAGIC 0xf33dc007
 
 #include <mongo.h>
 
@@ -25,6 +25,9 @@
 extern int
 mongotcl_cmdNameObjToBson (Tcl_Interp *interp, Tcl_Obj *commandNameObj, bson **bson);
 
+extern int
+mongotcl_cmdNameObjSetBson (Tcl_Interp *interp, Tcl_Obj *commandNameObj, bson *newBson);
+
 extern int
 mongotcl_mongoObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objvp[]);