Paulpash
Masterpiece
Could you give more detail on what you mean by wedge? I have a hunch, but would rather hear from you.
Where roots needed to be separated from each other I've used all manner of things to act as wedges from small stones, cut down dowels to notched straws - anything that kept them in as radial a fashion as possible. Nowadays, I'd use a board & nails to do it similar to the ebihara technique as posted by @markyscott but this was before the advent of Internet bonsai forums - you just had to wing it.The root is moved into place and then a nail or screw is driven into the board to stop it springing back.
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