[texhax] marginal note for paper-fold mark

[Calum Mackay]

Would anyone know how I might, with LaTeX, print some paper fold marks 
at an arbitrary place on the paper? I'm happy to calculate the positions 
myself, if necessary, I just don't know how to say "print a marginal 
mark (x, y) inches from the top-left corner of the paper. Any ideas?

I'm aware that some classes have this built-in, e.g. the scrlttr2 class 
from the KOMA-Script pkg, but this seems like overkill for what I need.

any ideas appreciated...

cheers,
c.