Oh dear!

On the bright side, you won’t have to drive in the heat of the day when everyone else in France is on the road because it’s a holiday.

I’m racking my brains to find a way around the drill not being quite long enough. If you can’t risk making the holes in the sheet when it is away from Bertha, maybe the only solution is to buy or borrow a longer drill bit. I’ll look out for one.