Tightening Metal Shower Handle

[Matt1989]

Hi Folks,
My shower handle has come loose and I know I simply need to tighten the screw, however I can't work out how to access the top of the screw. Does anyone know how the do that to the type depicted?

 

[Plumber69]

Hi Folks,
My shower handle has come loose and I know I simply need to tighten the screw, however I can't work out how to access the top of the screw. Does anyone know how the do that to the type depicted?

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Sometimes the part you grab to turn it on will un thread