difficult to engage button [SEP] i bought this for my shih tzu but it was much bigger than i expected the button to engage and disengage the tines is very difficult to push and i do not have the strength in my fingers to engage it i need to use a screwdriver to push the button the bristles are stiff which makes brushing easy and the self cleaning is a charm i am hoping the more i use it the easier the button will become this would be great for larger dogs and for those with strong hands to push that button