https://m.youtube.com/watch?v=mq4l2Yr9egM
I've been following this guy's Supersport rebuild and he's just got to the stage of reassembling the barrels and heads using the black studs.
At 18:25, he shows the special tool needed to tighten the head bolts and how to use it (at 90° to the torque wrench). Dimensions are also given if you want to make your own.
Interestingly, at 19:50, he quotes different torque settings for the silver and black studs (42Nm silver, 39Nm black).
By the way, if you watch the video through from the beginning, you'll see just how useful Richard's home-made circlip tool actually is.
http://www.ukmonster.co.uk/monster/s...postcount=1070