And a section view, for those interested.
That's really cool. Not really sure how feasible it would be to add this, but I once used a tamper that had a similar design but gave a little click when you reached a certain pressure - was good for consistency.
I considered adding that, but it would add a lot of complexity and would probably require re-adjustment every time I switch beans.
@Drano started
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And a section view, for those interested.