In ancient times... there was a device you could put near the fender well of your car that would alert you about being close to the curb. If I recall correctly, it was a spring-wire combination, a spring that continued as a straight wire.
Are there any such metal pieces, maybe using stainless steel wire less than .09" in diameter for the spring and the wire?
I need that for something like training wheels, but it will be light duty and preferably without the wheels (because it cannot be allowed to catch on rough terrain).
Thank you.