The new style Mnandi is much more difficult to open one handed than the old style. Some of it has to do with the detents, but it's mostly because of the nail nick. The old style Mnandi as well as some of the new ones had the old nail nick. It was sandblasted and slightly rough to give you grip. Most of the new style and the ones currently being made use the new style nail nick which is stonewashed like the top of the blade, hence making smooth and not grippy. I do notice detents have changed ever so slightly as well. Some people use the pinch method and you can open it one handed, but it's more manipulation. With practice you can open the new style one handed, but in my experience, the old style was far easier and refined. Between the two styles, I would take the old style Mnandi hands down.................it's one of the few changes CRK has ever made that many just do not like. It's the reason I have very few Mnandi now.