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What are my options? Different headset?
Chris King do oversize cups, so if your head tube bore is over spec (30.0 is the normal spec, CK actually suggest 30.1 for their headsets) they can supply bigger ones, presumably in 0.2mm increments.
FWIW, I've had an M-Part headset which was a drop-in fit too, so it's worth taking a proper measurement. @Scilly.Suffolk could well be right, but there's no point paying for another headset until you know where the problem is. You'll need a suitable size telescopic gauge and a 25-50 micrometer. Obviously you're unlikely to have these about your person, but your local machinist should have them and will probably take measurements in exchange for a drink*
*see https://www.lfgss.com/conversations/226366/?offset=175#comment9384332 for exchange rate
My new headset cups fitted into my new frame without need for a headset press. Installation and tightening seemed fine, until a test ride. The cups are clearly too loose, as there's audible play under the 'front brake rock' test, and the same is felt when out on the road under reasonable braking also.
What are my options? Different headset? Shim? Loctite? Fubared?
Frame is a 2001 Look KG386, Carbon moulded with what I presume is an alloy headtube.
Headset is an M Part Elite Inch Threaded.
Thanks. Al.