I never had a problem with the originals popping off, but they just had a mile of play in them. I did put parts bags under them which tightened it all up, but not ideal.
I've seen cars with schumacher/hpi/losi ball cups on and have no play at all in them.
If the HD ones take out the play I'll get a pack ordered!
a 3 year old B44 I borrowed had zero play in the links and my new durango had loads
