It is only 2 bolts and takes less than a minute to pull them to take the plastic cover on or off.
Far less time than having to, find a rag, wipe off all the crud that has accumulated, find some grease or wd40 to put on it, clean the grease off of my hands, Don't take the time to find something to clean my hands so I wipe it on my pants, throw pants in laundry, sleep on couch next 3 days for getting grease on all the other "good clothes".
Much easier for me to just take off the cover those 5 or 6 times a year I use the brushhog /forums/images/graemlins/smile.gif