Mini Diansheng screws and springs?

[rubixwiz031]

Hi guys.
I am currently making a half truncated cube with a mini diansheng.
I want to tighten it A LOT so I can do some finishing touches with sandpaper (if it's loose, it will pop like crazy).
Even with an electric drill, no matter how much I turned the screw and try to tighten it, it just wouldn't get any tighter.
Has anyone here had the same experience?

 

[Yuxuibbs]

Mine is the same. I just gave it to my brother after figuring out that I couldn't tension it.