Hurt people hurt people

Would be interesting to see stats on how many children have a mother and no father and vice versa. Trying to establish if women are more likely to be abusive or if the numbers are comparable when you factor in the quantity of absent fathers.

Do you have access to the bottom of the “part to be fastened”? I was thinking maybe you could use a nut and bolt instead of a screw and have a nut at the bottom of diagram 3.

Failing that you could try a rubber washer under the head of the screw, should absorb the movement from the seat.