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Rewinding this spring is a bitch of a job, but I remember the price qouted for a new seatbelt was the best part of a week's wage, so it is worthwhile. You have to very slowly and carefully wind the spring backwards against the way it bends naturally. (Yes, so the entire main spiral has to be wound the opposite way, inch by inch) I seem to remember that the bit that fits in the centre is shaped like an 'e' when it is fitted into position correctly (this is for front right seatbelt, so probably shaped like a backwards 'e' for front LHS). You then start winding the spring inch by inch, starting from the centre. You sort of feed the spring into the holder, it pushes to the outside of the circle because it is being wound against its bias, and then pull it tight into the center so you have room to insert more coil around the outside. You have to keep the pressure on it with one thumb to make sure it doesn't explode out on you again - take your time. To finish off, you insert the other end of the coil wherever it fits on the outside of the guide. Tie some string tightly around the coil unit to make sure it doesn't spring out on you before it is reattached to the main seatbelt unit. Just before you completely tighten the screws to reattach this section to the main unit, cut the string and then slide it out.
The confusing thing in all of this is, as you say, the 's' shape of the unwound coil. The reason for this is that most of the coil is wound against it's natural bias. I hope I have most of these details right. I'm only going by a vague recollection of this job, but you get the general idea. Good luck.
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