Buffer Tube problem

i'm having a problem removeing my buffer tube and any suggestions would be helpful. I was disassemblying my gun the pariot 2 (here is a link to the gun http://www.airsoftgi.com/product_info.php?products_id=2522) to fix my gearbox and when i tryedto remove my Buffer tube i couldn't find any tool small enough to fix down it so i tryed to look around on the internet to find out what tool is used to remove it and everthing said a philips head but the hole in my buffer tube is too small to fix a philips head down.

Anyone know what tool is used to remove a buffer tube with a really small hole were you unscreaw the screaw holing it in place?

have you tried a Precision Screwedriver, they are pretty darn thin and should fit just fine.