The title says it all: my trills on piano are really terrible, unless they are 1-2 or 2-3.
Anything involving the 5th finger is especially awful.
I have the same feeling of frustration of when I spent ages trying to fret a barre chord on guitar without it sounding awful before I figured it out.
So, what techniques, drills and excercises do you use for your trills on piano?
How do you change your position when playing trills as opposed to "regular" notes?
I guess arm weight doesn't help here, how to compensate? I have had mixed success by slightly flicking fingers, electric bass-style. Is it a legit technique?