After solving all your problems, it's time to sketch at least a rough outline of what your invention will be. The most important thing at this stage is to remember that this sketch must include all the solutions you've come up with. I advise you to get a sketchbook and keep it hidden from prying eyes that might be tempted to steal your ideas.

You don't need to be an excellent draftsman to make these sketches, as they only serve to help us improve the final design or mechanism of the invention. I myself have no drawing talent, which has never stopped me from reproducing the precise shape of the object that haunted me. It simply takes me a little longer. Most people have a lot of difficulty imagining an invention if they aren't presented with a detailed sketch. This is normal, and that's why your sketchbook will be very useful when you want to know people's opinions on your project. I advise you, however, to ask those who will examine your sketches to sign the page containing that drawing. Such a signature could eventually be useful if you need to defend your rights.

You should also take notes in your sketchbook. Continuously detail your sketches, noting the specifics of any changes you make as your work progresses. This way, later on, you'll be able to remember why you discarded or retained a particular element. You must persevere until you are completely satisfied with your final drawing. You may have to fill dozens of pages, but until you are convinced that the drawing is perfect, you cannot move on to the next stage.