No, as in the bolt that goes into the end of the crankshaft and holds the main pulley (and sprocket) that drives both fanbelts and the power steering pump (as well as the cambelt). At least, I think it's that one.
According to Haynes, the B21/B23
only is tightened to 122 ft-lbs, but the other models are tightened to 44 ft-lbs (use a torque wrench, don't guess) and then another 60 degrees of turn to create the correct tension. The last part should be applied in one smooth pull. After a stretch bolt has been used once it should be replaced with new, as it gets work-hardened by the stretching.
I'm about to try contacting my dealer to see what he says.
Ed: OK, the bolt for that pulley is £2.22 if I heard correctly (+VAT, obviously), and will need to be ordered from the parts warehouse. I've asked for two, they should arrive in a few days.