There weren't any screw covers. I don't think Australian delivered ones had them but I could be wrong.
I ended up getting a drill bit designed to take a 1/4" hex bit. It was slightly too long but I managed to get about a quarter turn out on each screw. It seems to be running much better now, even when warm. It did still stall 50m down the road at the first intersection with the choke on and I found the idle way too high once warmed so I knocked that back down to 1400rpm again.
I'll have another play with the hose trick and let you know results.
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