Normal Rotations and Slide Normal Thief MAXScript

I try to rotate specific normals from the Edit Normal Modifier.

normal = getFaceNormal refObj f
append normalist normal

with this I get a normal of a choosen face. In the secnd Step i want to rotate this normal. How can I archieve this?

Also does someone know where I can find the Slide Normal Thief MAXScript (Its gone :/ )?

Greetings and Thanks in Advance