How to clean 8-way controller?
Down-direction of the 8-way controller in my 6D does not work anymore. It's behaviour has been degrading slowly so the problem could be some kind of dirt between the contacts. Is there a way to clean it without opening whole back cover? If the back cover has to be opened using the guides here is there a way to actually access the contacts of the 8-way controller and still be able to put everything back together?