[MikeK]

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Just to throw a little GEEK in here, the number of turns in a motor winding is far more important than the exact wire length. The magnetomotive force, "MMF" measured in Gilberts, Gauss, or by Hopkinson's law or Rowland's law is a function of amperage and complete turns about an axis.

Getting back down to earth, if you rebuild any motor it is important to count the number of turns you remove. Don't worry about the exact length having a miniscule difference in resistance, especially in a series wound DC motor like a horn.

If you re-wind an original 45 turn coil to just 3 turns more, or 3 turns less, you will change the MMF about 7%.