[Jenny]

I don't do that, but if I'm not sure what the parking will be like, I might put a clean, crushed soda can in my pocket before I go. I have been lucky so far. Every time that I've parked on gravel, I've been able to verify that my bike will be stable enough without the soda can. My partner, however, has a much larger (and heavier) bike, and I've grabbed some stones and/or chunks of pavement or crushed a can while he held his bike!