I have been trying to get this technique for a couple of years now. Especially now that I'm getting into playing gypsy music this technique is a must have for it. Is there any possible way someone can help me break down how this technique works? What I do is very very bad. Whenever I make an effort to play it my whole arm tenses to the point it hurts it. I know it needs to be the exact opposite, relaxed, most of the technique is in the wrist much more than the arm....I know those details but I still can't get the technique mastered and far from getting it with how my arm tenses up....

Can anyone possibly help me please??