Why do I keep breaking rocker arms?

OK, @Slugfarm , I grabbed a pic & turned it.
Excuse My poor fingertip scribble, what are the lines/marks at the red arrows, & is the adjuster ball offset as it appears or optical photo illusion(possible)???
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Damn. Wish I'd seen this while it was still light out. I hadn't notice those in my visual inspection (pretty cursory one I admit). Regarding the ball and cup I've been having difficulty getting a good look at what's going on down there. I think a lot of What we're seeing is distortions from globs of oil. It's very well lubed, and hardly any oil mess after a two or three minute coverless choked idle.