Oh crap; well,as for A727s, I've only done a few of those;
As for A904s, I've done about everything from 1967 to 1980;
and I cannot recall ever seeing a ball in any lower half.
However, I seem to remember seeing a lower half that appeared to have a ball-cavity up near the accumulator area, but not a ball in it. Not sure. In any case It doesn't show up in any reference materials I got
