[johnbuckley]

The spring stops the pedal from wenching the stop light switch whilst allowing sufficient to pull to switich it on . Things get claggged up with muck, a good clean is often indicated, careful adjustment of the spring is sometimes neededto get just the optimum stretch. ( in my case aI've fitted a sshortt length of chain so that spriing loading can be adjusted easily). I've heard that some repro switches are of poor quality( so what's new eh?)