DrT, very good question... see how long it stays on 5... if you have to venture out below 5 again Id insist on a replacement... .. The lowest Ive gone on mine is 15, and that was for a ristretto double
)- the metal surface appears to be crystalline - I suspect they have used an Aluminium alloy rather than pure Aluminium.
) seems to be cast from a single piece. 

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