Shower riser rail. Help!

[Alfaj]

Hey. I’m trying to release the bottom of a shower riser rail so I can slide on a new shower head holder.

The problem is I have no clue what I’m doing. I’ve removed the caps on the top and bottom of the vertical bar to see what is holding it to the horizontal bars.

I thought I’d find some flat-head fitting I could easily rotate. Alas, when I crouch my 19 stone frame into the shower tray and crane my neck up with one eye closed, this is what I see...

I’ve no idea what tool I’ll need or where to go from here. Any advice would be greatly appreciated.

Thanks.

 

[Deleted member 267285]

For some reason I can’t see photos

 

[Elkato531]

Probably need an allen key. 3 or 4mm maybe. Buy a cheap set and you should get one that fits.

 

[Alfaj]

For some reason I can’t see photos

Updated the photos. Can you see them now?

 

[Deleted member 267285]

Updated the photos. Can you see them now?

Yes, it looks as per @Elkato531 said, Allen key.