BTW, every time I look at that passage, it seems like it should be easy. The highest note is F# below the mid-string A harmonic, easily played in 3d or 4th position. The problem is the accidentals. Playing across to the A string and back resulted in at least 2 awkward shifts across strings, precarious and line-destroying. Try it yourself. And if you find a better solution than mine, *please* tell me!