I just had a deck built and it failed inspection, partly because of the lack of a graspbable handrail (see also my related question How do I install concrete blocks to support deck stairs?) . The current rail is a flat 2x6. The inspector said I could attach a 2x2 or similar handrail to the balusters with a bracket of some kind.
I've done some googling but I can't quite find the kind of bracket it sounds to me like he's describing. What should I be looking for?