Suzuki 2 Strokes

hi, can anybody point me at a decent site that's got the ins and outs of rewinding [and unwinding] your own primary and pulser coils? these are the 2 coils off a ts250 magneto. i know it's probably not cost effective and probably more trouble than it's worth, but i just fancied having a go at it apart from that, i've got 2 sets of knackered coils that will end up in the bin if i don't try something. many thanks.
cheers, dd.