How to fix bath mixer spout that came off wall?

[jacobm]

Odd issue, the spout from my bath mixing unit has come shooting off the wall spigot while filling up the bath (i.e the tap was open on full pressure).

 

The spout only relies on 2 small grub screws tighting against the smooth, curved brass sides of the spigot. The screws do have a pointed end, but it doesnt press i to the spigot.

This same thing also happened 6 months ago, so it's not isolated, and I know the screws were tightened up as much as they could be without stripping the heads.

Is this a normal mechanism, as it seems really unsecure under a full mains pressure water line? Am I missing something on how it's attached properly? Is it busted and I should get a new unit?

Just looking for advice if it's something a I can fix myself or if I need a plumber.

 

  

  

[jacobm]

Yeah thats right, the two grub screws on the back face are just there to locate the spout on the horizontal axis, then the spout is fixed in place by the angled screws on the underside.