Great point, and we’re actually printing and sending out tightening instructions for all carts.
We’ve had a lot of people under-tighten the screw-on lids, mostly because people are afraid of breaking the Ceramic. The truth is, Zirconia Ceramics aren’t breakable like regular ceramic. We’ve baked the threading right into the post, and I have yet to see a post break.
I screw my screw-ons as hard as I can. Grip by the base, not the glass, and twist until you can’t!
If it breaks, we’ll 100% replace it! Haven’t seen it happen yet though!