How did Mercedes and Ferrari fall foul of F1’s plank rules?

In fact, there have been remarkably few times in F1’s history that planks have been found to have worn down too much – with the most famous still being Michael Schumacher’s disqualification from the 1994 Belgian Grand Prix. 

This makes it even more intriguing that, in an area of the car that teams are very mindful of there being no room for error, two of the top squads tripped up on the same race weekend. 

The explanations as to how the…