Vivien 3 First, the holding ball is too tight and prevents insertion of normal adapters.Second, the head is too wide and it was useless since it doesn't fit the holes in my car (audi).I had to pull hard to rip the head off, the ball jumped and got lost. Now I can use it by stuffing paper or straw strands in the hole to create a controlled jam that holds the adaptors. But eventually got the job done, so 3 stars.