Various ingenious attempts have been tried and some work within limitations but the low frequencies are usually transmitted through the fixing point irrespective of the isolator. For higher ones the acoustic path can be more significant but the radiation may not be from the obvious source of the sound. If you hit the bottom of the pole the sound tends to be conducted up the pole and the acoustic source that the microphone hears may well be vibration of the bracket bolted to the top. Use your fingers to tap and rub the pistol grip or the boom-pole. If the rustling sounds are very distant then the isolation is good - you are hearing them from their real source.
Further improvement can only be by suppression of the source - try a soft fabric grip on the pole.
The cure is the same but the improvement will be greater. At least in this version of handling noise you have direct control over the generator. The only other important thing to remember is that having analysed your kit and cured its defects you then keep it quiet. Written by Chris Woolf, technical consultant for Rycote Microphone Windshields. This article was commissioned for Sound Pro magazine and published in the Oct 97 edition.