I’ve had my Niche Duo for a few weeks and really loving it so far.
One thing I’ve noticed is that the screw that holds the bottom burr in place tends to be a touch loose after a day or so of grinding. You can tell when it’s loose because when I turn the grinder off there is a small change in the sound which I assume is from the bottom burr slightly moving as the motion comes to a stop. I’ve tightened it with a fair amount of reasonable pressure, and it still seems to be loose anytime I do a burr swap.
I recorded a quick video to visualize what I’m talking about. The first part is how I find the screw/bottom burr anytime I do a burr swap, and you’ll see that the bottom burrs have a bit of movement. Then I tighten the screw on the video, and you’ll see that there is no give. Here’s the link (let me know if this doesn’t load for any reason): https://www.dropbox.com/s/tv9qlcoj4dayfqh/IMG_5953.MOV?dl=0
Does this seem normal? I saw a comment in an earlier Duo thread here where someone else also mentioned that screw being a tad loose. I’m fine with it if this is expected and doesn’t impact the grind quality, but don’t have a good enough sense of the grinder mechanics to know whether this could be impacting things in a negative way.
I’ve not tried to over tighten that screw, just reasonable pressure to where the bottom burr doesn’t wiggle. Anytime I change the burrs after a day or so of use it’ll be back to that slightly loosened state when I check it. Would love to get any thoughts on this from those who have used the grinder for longer than I have.