I'm afraid the problem will show up again, as the NDS spokes in my new wheel are very loose. Two were even completely loose after I had done about 100kms. Luckily on a paved road. The wheel has been built in a small family shop, the guy having a glass of beer next to him. The spokes are probably not DT or Sapim!

Is there a fool proof way of tightening the spokes that I could use by myself? I'm about to hit gravel roads again. The other option is look for another shop and rebuild the wheel, as I'm in a bigger city now. But it's hard to ensure the quality of service. They always do a bad job here knowing you will never return to complain. And I'm tired of thinking that this and that bike shop f***ed my bike up (has happened several times).