Hey Folks,
I'm in the market for a tamper, and I always thought they were all flat and that you just measure the inside of your portafilter basket and buy the appropriate size. After reading a few discussion on Bx, I'm guessing that the convex one increases the surface area of the coffee, maybe? But beyond that, I know nothing, including why I would want to increase the surface area of my coffee, if in fact that is what I want to do! Can someone walk me through the ins and outs of choosing the right tamper? I'm using a Rancilio classe 8 2-group machine.
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