I ended up grabbing a Kinchrome from Bunnings, but the guy reckoned I wouldn’t need a 1/4" square to hex drive adapter, and that even if I did they didn’t stock them. Got home & sure enough discovered that I do need some kind of adapter. Anyone know where I would find one? I have a set of 1/4" hex drivers, but the wrench is made for square sockets.
Also, I set the wrench to 6Nm (the recommended torque for the alloy stem / carbon bar I’ve got) and it’s much higher than I thought. I’ve tightened the bolts by feel to the point where I think going any further will split the stem face plate or crack the bar, but it’s not even close to 6Nm going by the wrench. I’ve never done up a stem face plate before…are they supposed to be super tight?
This says carbon bars should not be torqued over 5.1Nm. (It’s also a good guide on proper stem installation).
But…
If it says 6Nm on the stem and bars, and you trust the wrench, then they will be able to handle 6Nm. Just as too tight can be a problem - so can too loose.
So I emailed Competitive Cyclist & asked about the bars, and it turns out that they’re actually alloy bars wrapped in a carbon outer. Feel pretty stupid now, but the fact that they’re called “FSA CarbonPro” bars is my excuse :-). Andy from CC reckons I can’t do too much damage, and that cranking the stem face plate evenly up to 8Nm should be fine.