I just picked up a minty BM-10 (HC-5 element) at a hamfest for my K2. It didn't come with an adapter or 'docs but I wasn't going to be picky for $25. I have plenty mic connectors so I thought I'd make my own adapter (to include a PTT switch). I presume the 1/8" plug is for the headphones and the 1/4" for the mic? What is the 'pinout' for the 1/4" stereo phone plug? Thanks & 73 Mike - AD5IU