A few people seems to indicate that the fitting is too tight. Print one first at +5% if you want a loose fit and can use superglue. The stock nut should extend past the top to make it turn smoother.
The original levelling knobs on the JGAURORA A5 are too small and too difficult to turn, but there's not a lot of space to grow the knob. I decided to design one to make it a little easier to level.
However it is still very small as the space is too tight.
Note also that I printed mine tight with 0.1mm clearance - this is so I don't have to use superglue. If this is too tight for you, try to scale it up by 2% and then superglue it in.
Use walls 1.2mm
If it's too tight, scale it up. I printed it without much clearance so I can avoid using supeglue on this. It would work better sliced at +2% upscale if you want to use superglue on this.
Note use a brim as the object is too small and may not stick on some beds without a brim.