I wonder if I got the same product as some apparently ...
Installation / removal / cleaning childish, seems super sturdy (heavy enough like a real old product), and most important it grinds the seeds perfectly!
Flaxseeds are among the hardest to grind are completely ground is perfect.
This is in fact (and it is sold as is on the box) of a mill seeds (poppy, flax etc.), therefore the filler hole is not huge but very well suitable for the use, this is not a device to grind grain in industrial quantities, it is really specific to the seeds and it's great work :)