Rod , Air [WIND] is a very powerful element , alot of people learn from its energy, there is a real science there.
As for the bonnets & pins , my last car had a fibre glass bonnet the rear pins were long ????? , any way you would think the bonnet would tear in half the way it use to climb up [Pkue 250k was recorded], goes to show the force of the air brake??. Hey Rod are you the same Rod we use to kick about with in the earlier days , taupo etc etc . Any way have a great week end my friend ..... Grant