Most tiny cabinet knobs come with their own built in screws. Therefore all you have to do is to turn them in their holes by hand. If you are fixing or replacing old knobs, the holes are already there. All you have to do is unscrew the old knobs and screw in the new ones. You don’t even need a screw driver.
The time a cabinet knob falls off is the time to think if replacing it with a more elegant one would do any justice to your bathroom. If your old cabinet knobs are generic ones, they have to go. Buy some decent acrylic or porcelain knobs. These are cheap and are not easily affected by heat and humidity.
