Replacing spring on Fanatec CSS V1.5

[Angeltheartist]

I am trying to replace a broken spring inside of my Fanatec CCS V 1.5 . I did receive part from Fanatec . My issue is I can not find the correct allen key size to remove top plate which is held down by 4 allen screws. Please help.

 

[2pfspiff]

I don't know how much this will help,I would say by looks it is either a 2.5mm or a 3mm. This is only going by looks in a pic

 

[Angeltheartist]

I repaired the shifter spring , the allen key is the star head style , I forgot the size. Anyway shifter working again. Thanks for the help.