I really have a hard time believing that the pintle ball could have done any major damage....
I know that when it burns through it becomes a little object ' rolling' around in the precombustion chamber... after a lot of time there.... as in a ball mill.... but by the time it is small enough to go through the " tiny holes" in the precombustion chamber and get into the bore it would have to be really really small...
Anyone else had or heard of one getting into the bore ?
This is another reason to think that some of the possible descriptions of how events might have unfolded which others have proffered may be true.... but unable to be proven , absent abject confession on the part of the " hacks"...