Ever since I got Sony portable one-point stereo microphone (model number ECM-MS907, found here I wondered, "How the $%&@ do I attach this to a microphone stand? The hole is too big!" Again, leave it to Sony, you know, the company that uses only Memory Sticks in their Flash products (and they are the only company that makes or uses them), to make a microphone clip that is almost impossible to attach to a familiar microphone stand. Well, I did find one use for that threaded hole, for those of you who work with plumbing often enough.
Seriously now, I did find only two sites that sell adaptors for this hole. Sony must be out of their minds to be using an outdated microphone thread standard. Apparently it was used on old RCA microphones, and is still used on ½-inch inner-diameter metal plumbing pipes. The adaptor, which converts the familiar 5/8-inch fine thread on most microphone stands to the BF 1/2 (BF ½) thread (as Sony refers to it), is made by a company called Atlas (or AEA), model number AD1. It might be out of production.
As of the date of this post, this site sells the adapter for $20 US:
http://www.bigdmc.com/
As of the date of this post, this site sells the adaptor for $14.60 US:
http://www.odysseyprosound.com/accessories.html