A ball marker like the ones they use for Snooker.
I think he needs one for when he is cleaning balls so that h Iuri s runs have even less controversy.
If he had run over 526 balls I'm sure it would go against him in the record books regardless true accomplishment it would/will be.
I mean no disrespect but fear it would question the "authenticity" of the run.
Did Willie stop and clean the cue ball and balls during his run
1