You ever called in for troubleshooting and the person over the phone tries their best to help, but you can't picture what they're talking about? This makes things super-difficult for both of you.
Say you're calling in because your thread keeps coming un-threaded. The first question we usually ask is:
" Is the thread it the take-up lever? "
Of course, the response we get from newer sewers is usually--
" Huh? "
Not being able to see someone point directly at the thing in question is very inconvenient.
Most people when they try to identify parts and pieces of a sewing machine see something along the lines of this: