Several ways of skinning the same cat.... I use a straight edge to the swingarm pivot and score a couple of marks where the centre of the rear wheel spindle is. It's not perfectly accurate, but it's not that important as my frame is bent as a nine-bob note.....
Ian's method of using two bloody great straight edges all the way to the front wheel is generally though tof as the best way. I saw one of the BSB teams using this method at Brands on Good Friday so it's probably good enough for DD!
Ali
ps: If you use the torque wrench for when you're bolting into super-soft alloy crankcases, and not when doing up bloody great wheel spindles, you'll probably end up with less stripped threads......