my clumsy hamfisted driving with the old/original ball cups would lead to one or two popping off everytime i used the car (410), jumps, crashes, bounces off the track dividers, all would cause popping.
The newer HD cups (as supplied with the 210 and the V3) i've only popped two off, both times after sliding into a kerb/wall at speed. (and it was the same ball cup, i suspect i may have damaged it, if it pops again this week i'll replace it!)
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