Admin or Mod has mention : The tag is given out to members who have proven thus far to be genuine reliable honest traders. However, this tag is NOT a guarantee of a safe transaction and can be revoked at any time.

As standard picture can be request more even if seller din post much and end up u have agreed to buy it.
It's your own responsibility to check the item at the time when you received it.

As 1st u blame the seller for selling DEMO SET UNIT? Since he has stat it is used item.
Then you agreed and accept his Rm 100.00 refund.
Now turn up u say the screw none after a month+ . Keep accused the seller this and that.
Don't u think it is very unfair to the seller?

I don't think so anyone will help u since not really logic about this problem after a month.

From far my view : izzit u not happy wit the lens because DEMO SET UNIT end up urself remove it the screw and start blaming on Seller? < Anyway this is my view from my mind. not accusing u right now.. Only u know..