Can not disassemble my hair trimmer, help! :)

My dear repair people,

I'd like to take apart my hair clipper and replace the proprietary charger with a usb-c charger. Unfortunately, I can't even take the clipper apart!

Here are the steps I took :

• Removed the back cover
  

• I tried to take the clipper apart but noticed that more screws might be holding it in place
  

• I removed the top of the clipper and 2 other screws on the top
  

• I notice that there is a screw under this golden plastic thing
  

• aaaaaaand I'm stuck

The golden plastic thing can slide up and down but is stuck at some point. I tried pushing, pulling, twisting, but nothing seems to move !

Sorry this is might be a though one to solve, I did my best but I've been stuck for too long on this, any idea would help !

Thank you ifixers !