Aux belt tensioner 'spring' to tensioner body torque?

[Ills]

Hi guys just after a quick bit of advice,
I've read all the various threads and repair manuals about changing the aux belt kit and I confident I can swap it over with no probs (famous last words!) but after receiving my aux belt kit today I just wanted to know how tight the bolt needs to be that holds the tensioner spring/strut to the tensioner body/pulley?

Cheers