Wheel Nut:
It is possible to insert cards the wrong way up,
If inserted upside down then it fits but will not do a trace - of course I have NEVER done that 
If you can see the ‘recording/trace pins’ then the shiney side faces them.
Wheel Nut:
It is possible to insert cards the wrong way up,
If inserted upside down then it fits but will not do a trace - of course I have NEVER done that
If you can see the ‘recording/trace pins’ then the shiney side faces them.