Yeh. The FIRST thing you HAVE to do after a race is to get the car up on jacks and rub all the stones off the tread with a pair of leather gardening gloves, while the tyres are hot, otherwise they just get stuck and you are in big trouble.

Things were a bit better this year, but there always seems to be stones on the concrete. A good broom is essential kit for the garage area.

I remember Ruapuna was bad for this with a lot of the pit area littered with stones, sharp ones, and what is more these seem to get carried from the dummy grid out onto the track at the end of the front straight. First couple of laps into a race, whammo, chips on the windscreen.
Think Teretonga was the best with all it's grassy areas. Lovely track, pity it is so far away.