These bar stools are used only for few months, one of them is perfectly alright but the other one's adjusting lever fell inside the stool so the height cannot be adjusted for that one ( I don't know how to disassemble and get the lever out), the good thing is that the set height is 72 cm which is perfect for sitting against any kitchen bench top we were using it like that. Some cleaning will get there shine back, they are sitting in our garage as in our new home we do not have kitchen benchtops.
since the lever is still inside the stool so you can also try and fix it later if you want.