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@Smallfurry
Oh, did you go for the ISP in the end? I demand that you do a metric ton on it, 'bareback', and post you evaluation of comfort.
I was thing of getting one of these for adjustability.
http://www.cycletaiwan.com/shop/index.php?page=shop.product_details&category_id=41&flypage=gk_flypage.tpl&product_id=264&option=com_virtuemart&Itemid=53
Fits 34.9mm diameter seat tubes.