I just bought a used Time-O-Lite model P-72. It works fine, but the Time Selector on the dial is incredibly, incredibly stiff to move. I wanted to remove the red pointer knob so I could try to loosen the time-selector. It appears that there are 2 tiny, tiny square head set screws holding the pointer knob in place, but I can not find a tool small enough to fit them. Does anyone know what I can use to get the pointer knob off? Or am I being too sophisticated and it's just supposed to pop off somehow? Any help would be immensely appreciated. Such a simple fix has gotten very frustrating, but I am determined to loosen the selector. Thanks so much!