Without trying to stir the pot again on the detent hole issue, I did want to report that I received my second one today, and I (Edward Sissyhands) was very elated to find that it flips easily, just like all my other 0801s. That caused me to look more closely at the detent hole on this one. It doesn't look anything like the detent hole on the first one I received (which looks the same as al g benny's and has a super strong detent). In fact, the detent hole on the newest arrival is even smaller than the detent hole on my standard 0801! That probably explains the ease of flipping.
In any case, I don't know what the design (regular vs strong detent) was intended to be, but I'm very glad to have scored one that flips very easily and smoothly. I was trying to make peace with the super-strong detent and rocket-fire opening on the first one I received, but I'm very glad to have another option.