Originally Posted by
Blknight.aus
Never got the fascination with having driving lights the best way to stop them from being stolen is not to have them.
putting a roll pin through is the best way to install them while still having them removable and a 3x15mm roll pin is whats required in an M10 bolt To keep the adjusability of the lights double nut the thread and leave about a 2mm gap between the nut thats actually doing the work of mounting the light and the one thats going to give you your security.
In the security nut drill through it on the flat then hammer in the roll pin in most m10s will have a minimum of a 17mm nut on them so center up the roll pin, then solder fill the ends, file and lightly polish the solder fill the gap between the 2 bolts with grease, wipe of the excess then paint