[codefox1]

The humbucker winding was to reverse or nullify the inevitable 60 cycle (and it's more audible 120 cycle) hum from your ears by creating a counter force out of phase. As noted, may or may not be present depending on the speaker and set. Silly at best with a period speaker less than 6 inches in diameter. If this winding is compromised, just up the value of your filter caps a little bit, say 10 % down the line, to take up the slack.