Loose shower head - how to tighten

[bdw]

I have an electric Redring shower. The pray head has come loose and it won't tighten meaning that the shower head on the riser bar wont stay in position. The head has a screw that is meant to tighten the swivel head but it just keeps loosening off. I have attached pictures of the head and the screw.

Obviously the easy solution would be to replace it but I have looked into this and it has been discontinued so I'm looking at some way of tightening the offending screw so that it will stay tight enough to support the head.

 

[just pumps]

Sometimes two or three wraps of PTFE around the screw works for awhile or a drop of Screwlock if both surfaces are metal.
Think there is a rubber grip ring behind the shroud for a proper job.

 

[CBW]

Is it the spray head or actual holder? Looks like a hairline crack in holder if that’s what you’re referring to.

 

[bdw]

Sometimes two or three wraps of PTFE around the screw works for awhile or a drop of Screwlock if both surfaces are metal.
Think there is a rubber grip ring behind the shroud for a proper job.

I'll try PTFE. (The fittings are plastic)

 

[bdw]

Is it the spray head or actual holder? Looks like a hairline crack in holder if that’s what you’re referring to.

It's the holder or rather the screw tightening the holder.

 

[bdw]

Sometimes two or three wraps of PTFE around the screw works for awhile or a drop of Screwlock if both surfaces are metal.
Think there is a rubber grip ring behind the shroud for a proper job.

Tried the PTFE without success. Think I'm going to have to try to find a replacement rail.