On Sun, 24 Jul 2005 01:47:52 +0100, (Steve Firth)
wrote:

Take a piece of steel, shape it into a wedge. Make at least two of them.

You're better off buying them (although not from Northern Tools). It's a
tricky piece of smithing to make a good log splitting wedge. They take
an awful pounding at the back and you don't want them splitting, nor do
you want them too soft.

If you have some, railway line makes good wedges (manganese steel).
I've got as set here that were supposedly made of armour plate from HMS
Nelson (broken in Newport) and have certainly lasted pretty well.