I asked a friend who is a native German-speaker and she couldn't decipher the handwriting. The google translation I got from "Beim nadel einsetzen gehört die lange eine gegen das rad"
was
"Insert the needle is a long one against the wheel"
Perhaps it means something like "insert the needle with the flat side towards the wheel". (Unless it's a round shank, in which case nevermind!) But I'll bet you already know how to do whatever it says.