Why not just play in the middle of the keys instead of on the edge? You don't need to push your fingers sideways so they scratch against the edge of the next key.
Because I need to turn my wrist in time to play another octave of arpeggios, the fingers get pushed to the edge of the next keys. Do you know a way to play fast arpeggios without the fingers scratching the key sides?
Have you checked out the resource I mentioned?
I am sorry but which video do you refer to? I found a few Zhdanov tutorials on YouTube but they are around 15 mins long only.
Because I need to turn my wrist in time to play another octave of arpeggios, the fingers get pushed to the edge of the next keys.
Do you know a way to play fast arpeggios without the fingers scratching the key sides?