I’ve been wondering if something sitting on top of the beans in the hopper (eg a bag of rice) would stop new oxygen reaching the beans as their level drops. Ideally, the hopper would be cylindrical and the object a simple disk, but mine is the usual conical shape. Or am I over-thinking this?
That assumes that a gasket would create a vacuum in the hopper over time. I think fresh air will find a way in anyway. Filling that space with a balloon or a bag is simpler. I will be surprised if this hasn’t been done already by a grinder or accessories maker. There are plunger canisters already.
vacuum? What. No it just limits where new air can get in. Fresh air will always get in yes.
I have a small jar that keeps about a weeks worth out of the bag, and then I grind dose daily.