As far as checking the sprag on rebuild, if the pins are straight, move on. Not believing failure could occur on a new sprag when a driveline part brakes, when it free-wheels and slams back under load, no way is it strong enough to not damage or brake it.
Totally disagree; rollers with flat spots can co-exist with straight pins. Sudden shocks occur with Clutchflites/Neutral and failures aren't epidemic with such abuse.
