After many moons of wrenching, I have learned the whole secret is to not break any screws in the first place. And I'm tellin ya, it take a lot of experience to get the "feel" of how far to push it before you just give it a break, and soak it, hammer on it, impact driver it.....back and forth, on and on, whatever it takes, but it WILL come loose in time.
If these bike are a real problem w/ this, maybe we should back them out now, (later models) and never seize them
Rich