It's possible, but I do not use the Sheldon Brown bolt setup when two flats are available. After a nice PB Blaster soaking, I use the Park HCW-4 and hold it on with a bolt, nut, and a couple of washers. I just hand tighten the nut so the wrench doesn't slip off the nut. A couple of taps with a hammer or mallet to the wrench to get the fixed cup moving. Works every time.