Handle on pop-up bath waste

[ayjay]

I am fitting a pop-up waste to my bath. i have the under side fitted and the overflow part fixed to the side of the bath, but i cannot see how to attach the handle part. it has a chrome piece which you turn, and inside this is a brass piece with an "O" ring which looks like it should slide over the rod sticking out from the overflow. the instructions, a series of pictures, show a grub screw which i cannot see, nor can i see anywhere it would go. is the chrome handle supposed to come off the brass inner piece? i have tried but can't see how to do it. can anyone help?
thanks

 

[Softus]

Often there's a hole in the side of the chrome handle, and you can poke an allen key through here and access the grub screw mounted on the hub of the handle.

 

[ayjay]

yes, the instructions show a grub screw but i just cant see it anywhere on the handle.

 

[Softus]

Is there a hold in the side of the handle?