ScoobieKW, yes, now that I look back through the thread with a fine-tooth comb, I see that your signature mentions the same Busman microphone type that the original poster had asked about. So if you know for a fact that the pin 3 -> pin 1 bridge arrangement is right for that microphone, great, and I'm sorry if it looked as if I was criticizing you for the advice that you gave.
But I still think it needs to be made clear that all solutions to this problem are individual, case-by-case, microphone-model-by-microphone-model solutions. Many people make the naïve assumption that there's got to be a standard adapter or wiring scheme for going from balanced to unbalanced. That assumption is not only wrong, but can cost you the success of your recordings, or more, and it's one of several things that I feel obliged to point out on this board from time to time because they keep coming up.
Input transformers used to be the universal solution--giving the microphones the balanced load that they expect, which is one of the best solutions for suppressing noise from interference (professional audio equipment is balanced for a reason!). But then one fairly well-known manufacturer came out with microphones that wouldn't work if there was a transformer at the input of the preamp, so even that solution is no longer applicable to all cases. Even setting that one, now-discontinued series of microphones aside, good input transformers are neither small nor cheap, so they're not everyone's first choice. Plus around here, people seem to think that transformers inevitably color the sound (but precisely what I mean by "good" transformers is that they don't).
--best regards