My neighbour had this spring put on the back garden gate by someone, to get it to be self-closing.
There is not enough compression on it to keep it completely closed and to stop it banging when the wind picks up.
I seem to remember seeing springs like this placed at a more vertical angle, but cannot think of a logical reason as to why this might be so.
Basically it needs some more compression on it to completely hold the door fully shut, (it stays open by about 8mm ). But its surprisingly strong and I cannot compress it enough and then put the screws in, to get it to have enough compression to completely close the gate.
Also I wonder why the ends of the spring have these holes, which are only about 3 mm deep. The holes are not there to turn anything around as there are no threads on it anywhere. And the spring can rotate freely at each end.
Novice grateful for advice for a more effective solution.