How snug should the tamper fit?
My current equipment is a Happy Donkey tamper and Gaggia Classic standard 58mm basket (again from Happy Donkey).The tamper measures 57mm, the basket 58-59mm.
When tamping there is 1.2mm coffee left round the edges.
I am looking to upgrade to a Torr tamper which comes in either 58mm or 58mm . The 58mm would still leave 0.6mm gap round the edges but the 58 would be a truely snug fit.
Which one would be best??
n.b – I emailed Cafe Culture and they recommended 58mm Convex base and suggested that modulation of loose coffee and edge sealing is better achieved with a ”slight gap”, they steered me away from the 58 . Problem is they dont know just how big my basket is, the 58mm would probably still leave a significant gap!