Making bolts anti theft

I’ve had a couple of occasions of parts being taken off my bike when I leave it at the station (bars, stem, saddle, seat post etc) but while security bolts seemed to be a deterrent against amateur thieves, pro thieves would have the security torx keys etc so my dad got busy at his lathe and made these little stops to wedge into a few Allen head bolts. Granted, the position is now fixed until I drill them out but I’m hoping it’ll deter even a relatively well prepared thief. Got a couple more to pop in but hoping it’ll make the rig that little bit more secure when I’m not around. What are you security bodges that have worked for you?