sure but very rarely I"ve tapped or smacked a car that was obviously cutting me off. Maybe one smack in 5yrs and a tap a few times a year. Using a wrench or lock is stupid.

The ones that get me is the person doing a left hand turn from the left lane in the other side of a fourlane two way road right in front of me as though I don't exist. That's when I started riding with a BRIGHT white strobe during the day in busy streets. The other one is going down a slight hill where the intersecting street at the light gets backed up bumper to bumper and i"m going straight. The guy in the opposite lane decides he has to turn when there isn't any room to go into the lane and he simply blocks the intersection. I'll give them a gentle pat so that the driver and others notice how close too close is.

The only time I did a hard smack was when an elderly person was shy about passing me even though I waved them through and I was riding a very straight line near the gutter. Behind them was an impatient person honking at them (I head the honking long before the elderly driver got near me). As the elderly driver SLOWLY passes me riding over the yellow line giving me way too much room(4'-5') the car behind was tailgating them and not giving me any room, or about 12". I'm riding about 17mph in a 25mph zone and the elderly couple car was passing me about 20mph and continued at that speed. It was obvious this ******* had been riding the old folks for blocks and as he passed me I hit his car nice and hard.

Bragi suggestion is a lot more mature and effective.