Fork slider removal

Hi guy's and welcome. Thanks for accepting me.
I have a 2012 Yamaha cygnus nxc125 and want to remove the fork slider out of the stanchion. But the bottom cap head is turning without undoing. Any idea where or how to obtain or fabricate a tool to go inside the slider to remove the cap head at the bottom of the stanchion. Kind regards Louis

 

Use a rattle gun. There are so many different kinds of tools to hold the inside

 

Yes I have a impact gun. It's the size/shape of the tool. Or where can obtain one cheers

 

That bolt is normally a 6mm allen key fitting. Or a Torx fitting

 

Thanks for the advice chaps. Torx could be the one

 

Terrible picture because of the depth