Why would you want to splice wire into
rope these days.
It used to be done particularly by the
racing types due to the stretch in ropes. These days MMF is good enough for most people on its own, but if you must reduce the stretch to an absolute minimum, then use
dyneema. This avoids the horrors of the rope/wire splice and its weakpoint in the
halyard, and also the need to use 3 strand rope rather than double braid
However, if your
boat does have rope/wire halyards, and you want to change to all rope, you will almost certainly have to change the sheeve at the top of the
mast.
If at the end of the day, your really feel you must, then here are some instructions:
Illustrated Wire to rope splicing instructions