Tamiya turnbuckle/tie rod ball ends....er things

[Pablo668]

The little plastic bit that threads onto the turnbuckles and clips onto ball ends on TRF buggies.

What do people recommend to replace these with?

I don't race (yet) but I'd like to know for future reference. I was testing out my 201xr and went into a high speed spin. I initially thought that I'd broken a suspension arm as one wheel when all limp.

The tie rod/turnbuckle end had actually come off the thread. I would have expected the cup to come off the ball end.....but coming off the thread?
And it was screwed in most of the way too.

Any suggestions would be appreciated.