Fox Knives FX-515W Ziricote pocket knife, Bob Terzuola design

It's an interesting pocket knife! Different from the usual, well built, easy grip, good blade, easy to use for different tasks. However, there is a problem that is serious to me: it is difficult to open it with just one hand unless you place the knife at an angle that allows you to use the thumb disc without just pushing it forward. It becomes frustrating not being able to open it quickly or having to place it in your hand in an unsafe position to do so.