Phil 850 wrote:
It's also surprising the number of people that don't realise you are meant to have the door open when you use the original jack.
Is this so that you can wind the handle round & round a lot faster than doing half a turn at a time.
I never thought of that

Yes.
People either have no handbook or have never read it.
I can't imagine how long it would take if you had to do half a turn at a time, let alone the risk of damaging the outside of the door.
You do need to be careful when finished jacking up not to let the door slam onto the top of the jack or you end up with a nasty ding in the door pocket!
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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)