A bit more on that single long slot FB Tech of mine... I was lamenting its aggressiveness in the January Focus thread. I had narrowed the issue to the cap but assumed that it was from erosion of the metal on the edges. I took a close look at it yesterday, however, and realized that the cap is physically narrower (shallower?) than a US cap of that era. You can actually see this somewhat in the picture where I compare it to my other FB Tech. The result is less blade curvature, a bigger gap, and more aggressiveness. I don't think this is a user modification, however, as things seem to uniform. Rather, it seems to have been intended at the factory. It actually reminds me of my least favorite Tech- a British post-War Aluminium Tech. That one is also narrower in both the cap and baseplate. Was Gillette in England producing razors to a couple of different measures? Or were there people who wanted a more aggressive razor in a sort of warm beer and sweetmeats pudding kind of way?