I'm looking to purchase an old Raleigh Superbe and the guy who I'm thinking about buying it from told me that the trigger shifter needs some work. Now, I'm rather new to bikes and am not sure what this means. In all honesty, I'm not even sure what a "trigger shifter" is. So I have a few questions.
1. What exactly is a trigger shifter, and what makes it different from any other kind of shifter?
2. Assuming the worst, if the shifter is shot, how easy of a problem is this to fix? How much would it cost (ballpark)? (Lets say I need to get a brand new shifter.)
3. If the shifter isn't shot, but only needs some work (as the man says), what would fixing this problem be like? and again how much do you think that would run me?