This is the way to do it, I just done mine and it's a 200mm. Get yerself a marker pen and as you find the wonkey bits mark them with the pen, then you know where to bend it. Be patient and don't bend it too far, you have to go pat the elastic limit or it will just spring back (i.e bend it about twice as much as it is out of true.) Prepare to be pissed off with doing it, it is very annoying. By the way, I don't bother using a rag, just the adjustable spanner, you can see how much your bending it better, the bigger the spanner the better. Matt