So, i previously owner a TT mount for a garmin 478 and was a bit disheartened by the fact that this "locking" mount could very easily be stolen by anyone with a small wrench or pliers. the four nuts that hold the mount on the crossbar come off in a matter of seconds. i just ordered a mount for the zumo 660 and it suffers from the same problem. has anyone figured out a way to secure a bit better? and yes, i realize that where there is a will and some time, there is always a way. i'm just looking to make it a bit more difficult than unscrewing four small nuts. i've looked into security type nuts but haven't found any in such a small size. any ideas?