You've got to "work" the brake down. Meaning you have to use both hands and work it back and forth (like your trying to start a fire with a stick using the old Indian technique). The key is to work it SLOW. Don't apply too much force because you'll hurt the threads. If you work it back and forth with a little lubricant applied to the threads... I assure you it will fit. It's just really tight. That's a good thing.