Once it is all glued together, allow all the glue to cure. The boom will be very sensitive to breakage at the headset. Especially so if you used a P...
In a noisy environment, (such as a bicycle or an old car on the highway) bluetooth headsets do not work well. Why? Because the microphone is so far away from your mouth that it would just as soon pick up the road or wind noise as your voice. No amount of "advanced voice technology" can get around that simple truth. Since I ride my bike to work, drive a 1971 Volkswagen Squareback and a 1983 Toyota pickup, road and wind noise is a problem for me. I also like to keep both hands available for driving/biking tasks instead of holding a phone against my head. I haven't seen any bluetooth headsets with a boom for several years now. It seems manufacturers are trying to keep them small. That is fine in a quiet environment. (a late model Lexus, maybe?) I don't have that luxury, so I decided to add a boom to my headset.
Step 1: Bust it. (or, how badly do you want better sound?)
This is the part where you take your $30-$150 headset and break it. If you spent an amount closer to the $150 side than the $30 side, you should skip this and buy a Lexus. I have been using this headset for over 2 years now, and was ready for it to be better and uglier, so it was an easy choice for me. I have been taking apart small electronics ever since I could turn a screwdriver. That didn't help me here. I can't speak for any other headsets, but mine had no screws at all. The two halves were glued together with a plastic welding glue. I just had to shove a screwdriver in there and bust it apart. Not pretty. When wedging your small screwdriver in there, be careful not to pry too hard against anything inside. I managed to get mine apart without damaging the batteries or circuit board, but the casing was pretty well destroyed. If I had it to do over again, maybe I'd be able to do it cleaner.