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Because he said he only used a tape measure doesn't make it true. From the way you describe the nicks, chips, whatever they were, I wouldn't be surprised if he used a calliper, or was careless in...

I used to take a photo of the razor on the ruler, but found the ruler on top of the razor is more revealing. It is still a bit tricky, camera angle, and what not, but here is what I do now, if I do...

The best thing to do, if you intend to sell on ebay in the future, is take it back graciously. Ebay/paypal are stacked against the seller, so you'll probably have to accept it one way or the other....