The Zero Disc Help required

[frantic57744]

Just wondering if someone could give me some help with a little disc detainer lock i got. How do i identify the the Zero driver disc what does the cut look like on the key ??how do you know if the zero disc is at the top or bottom of the keyway, This lock cost me £2 quid and it,s driving me nuts i,ll even donate it just to see it picked on camera any help advice would be highly welcomed

have you got the tools?

[frantic57744]

i,ve the standard disc detainer tool that applies tension to the first disc,