Originally Posted by
irclean
A ball bearing and some hot glue in the bolt hole is usually enough to deter most would-be thieves; they may be armed with an Allen key, but it's doubtful they'd have the tools or the time to dig out the glue. There are also security bolts if you know the size and pitch of the bolts you're replacing
If you use Phillips screws you can drill out the cross so a screwdriver won't have anything to grip. May not be much help for saddle security but I've used this method for securing license plates on my car.