Lack of finishing 2

I find this vice lack of finishing at the worm. I am in the mechanics and I find that there is too much play between the nut and the screw plus a Deburring effort could make this same worm. A lubricating minimum would have been appreciable. In my box we could never tired from a product in this state. Morality, barely in place, a file stroke on the monstrous blunder of the worm and greasing ...