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My mistake, the seatpost is actually 30.0 - I got an inline thomson but still doesn't bring the saddle far forward enough to put a bagman qr on...
Could use this, but not the neatest solution: https://www.sjscycles.co.uk/saddles/vk-saddle-adjuster/
Not an obscure tube set. Are you sure it/s not 30.9 which is quite common?