Opps, i didn't went back so far in the thread...
But i see now.
This nut will apply enough clamp force, because on the S3 versions the (triple)pulley
also drives the A/C compressor and the power steering pump too.
The compressor requires up to 15 horse power (depending on crankshaft RPM).
So don't worry if the nut can hold a triple pulley loaded with A/C, a trigger wheel
on a simple pulley won't be a problem.
(When assembling it's recommended to apply some threadlocking adhesive, before
setting the specified torque.)