A bit of an old thread, but found it while searching for something else.
Kershaw Speedsafe knives are great -- very fast opening and (usually) durable enough to last for thousands of actuations. However, in the small chance that you do get one with a bad torsion bar (a fairly small piece of metal, so there is always the possibility of getting one that will break), with the China-produced Kershaw knives like the Clash and Burst, you need to send the knife back to Kershaw for replacement.
They don't stock parts for the knives made in China. However, if you spend a bit more and get a USA-made Kershaw Speedsafe knife, they can send you a new torsion bar at no cost that you can easily swap out yourself. Even if the knife isn't broke they'll send you a spare torsion bar to have on hand if you ask them to.
Kershaw's warranty is awesome, but it did suck having to send my Tremor back when I drew the short straw and the torsion bar broke after a few months. I don't have to worry about that with my Leek since it is a USA-made Kershaw.