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It's quite flexible - take a look at the razor below which has quite a reasonable wedge shape.

http://i1270.photobucket.com/albums/jj611/ukrob1/IMG_1029_zpsec38b11b.jpg
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I think the whole thing is very handsome and the lined wedge really does set the scales off. As Bob said, scales need to be in proportion and about 2.5mm thickness is recommended. Personally, I would...