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It's not made in plastic I would say alloy. It's about 14mm for the diameter, which fits perfectly into the 'hole'.
Mine is definitely the same as the ebay listing, 25mm refers to the diameter of the seatpost.
What's the diameter of your seatpost?I don't know about JeJames Cycles but it makes no sense to sell only one part of the clamp.
Here is an other listing on ebay, showing also only half the clamp:
http://www.ebay.co.uk/itm/Look-Seatpost-Clamp-Bolt-for-25-mm-Seatposts-Fits-Kg451-361-381-481/172409847698?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D44293%26meid%3D862854e191bd47e699caef70ac2eb72c%26pid%3D100005%26rk%3D1%26rkt%3D1%26sd%3D152365963866Hope it helps.
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konadefer
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My seatpost diameter is 27.2, which should be fine. The difference in radius of the cutout would be so marginal that it wouldnt make a difference, and would still be better than the system I have at the moment. It does make me wonder why Harry Hall used this strange design if a working look version was readily available
Thanks for your measurement. I'll go measure mine quickly. Any chance you could measure roughly the length of the expander? Thanks
Turkish
Oh right, looking at the eBay listing I thought it looked different to how I imagined it. That type looks more secure than mine, although is it made of plastic? Any chance you could measure it for me please? Also are you sure yours is the same as in the listing? (I know nothing of old look frames) I'm guessing 25mm refers to the diameter?
Thanks!