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Bung? Mentioned it somewhere else on here.... hang on...
It was the long (52mm) ITM one, here:
http://www.ribblecycles.com/au/itm-carbon-1-1-8-expanding-stem-cap/
I tightened the headset again this morning. I'll see how it goes.
This is with the longer, knurled bung I replaced the stock one with.