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Also, can anyone recommend a good tamper under ~£25?
Honestly I'd just go for the cheapest thing that fits well. Presuming it's a 58mm basket you should have a huge selection to choose from. I've used all sorts of tampers expensive & cheap (including a fucking garish Rapha Chris King one) and I've never found a noticeable difference.
Main thing for me is how comfortable to hold it is. Though now that I'm using it 1 or 2 times per day instead of 300 or so, that's less of a concern.
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I’ve got one of these but in 53mm for my sage - good quality and works well, highly recommend https://clumsygoat.co.uk/products/motta-stainless-steel-tamper-wooden-handle-flat-base-58mm
They’re dead simple inside. And generally easy to take apart. Hope it works out!