When I took off my handlebars I used the 10mm wrench. It worked okay but if I want to adjust it with everything together it seems like it would be a pain.I'm guessing you have risers installed. Without the risers, a 10mm wrench works just fine. With risers, like I have, I still use a 10mm wrench, but have to carefully count the turns I make, since I can't see the lines on the sides of the adjusters.