Fret Rocking

[rainbowreality]

Okay, after doing a bit of reading I'm getting a bit confused as to best practice to find high spots.  Should I not be following the string angle on the neck and following the centre line with my rocker?  As I understand it, if I follow the string travel I'll be measuring for a compound cylinder rather than a cylinder and it's going to give a false measurement. Am I right in this assertion?  Any advice appreciated! 

[Dood]

Yes, rock in parallel to the string, including where the string sits specifically as worn spots can affect as well as high frets. Also, make sure your rocker is absolutely true and flat. There's tons of cheap ones on ebay and amazon that fail at their one and only job!