Possible Clues:

• Thin blue lines, maybe
• If you get the wind up, these bloody things will catch it, by the sound of them
• Bloody revolvers, by the sound of them
• Sounds as if the bloody things will help things get around
• Places for ore
• Those bloody vessels sound as if they catch the wind
• Where 37 Down is found
• Characteristic styles of wind instruments we hear
• Phlebitis targets
• I've got to the bloody poles