My brother has a Presidio, and it to doesn't have a sweet spot with a smooth action, but no blade play. I did notice that the blade stop pin that fits between the steel liners is not seated all the way. I then measured the space between the liners on the front of the knife even with the pivot, and the back, even with the pivot. It turned out the back, right next to the blade stop pin, was a much bigger gap. By bigger I mean in measurements of thousandths of an inch, not really noticeable eyeballing it. I don't remember the exact measurements, but it was more than I expected. You can check your knife by holing it up to a light source, and looking to see if light comes through the base of the stop pin(the part that should seat flush with the liner) and the liner. I tried squeezing and lightly clamping the scales to see if I could get the pin to seat flush with the liner, but it seems like the smaller diameter of the pin that is supposed to go into the liner is just a little to big.