i'm doing my 3rd year apprentice course thru correspondence, and just started hitting the motor control part of the course. the book and workbook (rockis, mazur) seem to be asking questions that i cant answer by reading the text. the word Q's are alright but they start to ask me to draw different line diagrams, with standard lettering, and line reference,etc. they don't have many example's to check out. is there anywhere online to get a better grip on line diagrams?