The straight end of the spring goes under the center of the pin and the curved side of the spring will go around the the shaft of the pedal. Put the pin in from the top going down, push in for...
I've been playing electric for 45 years now (yes, I'm a 60's relic) and I would say this: If you are not using them simultaneously - and you shouldn't - it makes no difference. If you want to use...