This adapter secures my bar and mirrors to my SV just fine. But I had never tried to install something like this before, and was confused for about 30 minutes until I understood the design. You see, there are four components that fit around the part of the adapter that slides inside the handlebar. These components fit loosely and would fall off or get out of alignment while I installed them. This was frustrating at first--Why don't these pieces attach to the adapter somehow? This is why: After placing the pieces around the adapter, you carefully slide that part of the adapter into the handlebar. Then you turn the screw at the outside end of the adapter, which pushes those four pieces against the interior of the bar and thus secures the adapter.