Dave, I see Bill has answered your question. Those tips do wear. But I hadn't heard of using oil before. I grease both the tips and the ball.
I've also been thinking about adding shims to my receiver as mtnguy suggests. But I'm probably more concerned about why I need to. Was my receiver that loose when we first started trailering 12,000 miles ago? Is this normal wear? The receiver is rated at 650# and has a substantial metal collar around it so hopefully it's not a serious problem.
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