I did it a couple of times when I first got my D2a, Now that the truck has "educated" me I no longer do it[thumbsupbig]
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today i yelled at the gearbox.
I still do it even after working on literally hundreds of Discoverys. I will be working on one that has good suspension or a 2" lift and all is fine, the next one will have a sagged suspension and wack!!
Lucky its only my head... so nofin much ere to bees damaraged [tonguewink]
Haven't done it on bros D2 yet ... which is strange considering I spend more time under his bonnet than of my own D1!
But have headbutted my D1 a couple of times.
RRC is the best. Dunno about the later models, but the earlier ones allowed the bonnet to flip back all the way to the screen due to it's external hinges.