just a thought, but could you tac or glue a paintball to an oxford lollypop extremity? it may leave a reminder to keep away next time without the damage my initial thought (claw hammer) would inflict..
Reminds me of forum member "Fingers"
@Andy-mat, master locksmith and safecracker - he glued a nail on the end of his pannier rack lollipop to scratch bodywork. Last seen walking his dog, somewhere in Germany. Mob might have got him.
To date, no vehicle has ever collided with my lollipop. Closest ever pass was more than a foot away from the end, plus 39.99999cm away from the end of my handlebar... and that's only because I was invisible around a bend and behind a bank, having exited a roundabout. The driver had already committed to a tight turn, and I suddenly appeared from behind the bricked inclined bank. Fortunately, I always stick to the left of the road. I leave the lollipop to command some of the risky middle.
I think perhaps one of the reasons the handlebar mounted lollipop works so well, is because drivers have a conditioned response to a bicycle and cyclist shape ie. IGNORE. A bright orange lollipop situated up high making the bike look worryingly wide, somewhat dispupts their cyclist-blindness? Perception of themselves expand to include whatever they're driving, and drivers would rather not have something bright orange touch and potentially damage the bodywork of their expanded expensive selves? Dunno. It works. You should all install one one IMHO. Makes road cycling so much more relaxing. You can fold it in for pavement riding.