I agree with those who say just replace it. It is money well spent. If you really want to do it yourself, use mechanical fittings such as StaLok or Suncor Quick Attach and duplicate it. Buy some extra wire for the learning curve.
I recommend that if you don't already have bronze open body turnbuckles, you specify those to the people making your new rigging. Avoid stainless steel closed body turnbuckles like the plague.