The purpose of these springs is to centralise the footchange lever after each gearchange.
The band is a push fit over the central hub and can be pressed off, it is a little more difficult to get it back on requiring the two springs to be held in place with a jubilee clip as it is pressed back on.
If you find the springs are worn I have new ones as does the spares scheme.
The pins should not affect the operation if worn. The short one held in the centre boss is merely there to hold apart the spring ends so the whole unit can be assembled onto the backplate.
Hope this helps