How to repair Bristan handle on shower wall control panel?

One of the control handles on our Bristan shower controls has become loose - see attached image. It looks as if a retaining screw has snapped (see the middle picture for what is left of the screw).
Could anyone advise on where I might get a replacement screw, and whether any special tool is required to fit it?


Many thanks.

Grub screw has a recessed end for a hex (Allen) key (2.5mm IIRC)

You could take your handle into your local motor parts shop and see if they have anything, or try showerdoc.com

Your plastic end looks a bit chewed up!

polesapart said:

Grub screw has a recessed end for a hex (Allen) key (2.5mm IIRC)

You could take your handle into your local motor parts shop and see if they have anything, or try showerdoc.com

Your plastic end looks a bit chewed up!

Click to expand...

Many thanks - I've managed to find an allen key and have managed to refit it.
Unfortunately the 2-way diverter valve that it is supposed to operate seems to be jammed, so this handle is now effectively decorative only :0(