Nokia headset adapter

Wanna listen to music from the radio or mp3 player of your nokia phone and go jogging?

What happens, the headset pops out of your ears

Suitable headsets can not be connected to the phone, since they have a standards 3pin plug and the phone wants 4pins

No standard equipment available

The way out, build yourself an adapter

Take out the inner axle

Wire it up and put some epoxy mastic

Drying-out and enjoy