Richard,
There is an amazing machinist and tool maker named Abilene Rios Wong who made
bunch of lignum vitae mallets from bowls a couple of years ago. I imagine some
Googling about will come up with more information and images.

Cheers,
John (who plays bowls in his 18th Century living history gentleman's
impression.)

“P.S. If you do not receive this, of course it must have been miscarried;
therefore I beg you to write and let me know.” - Sir Boyle Roche, M.P.

but now I have a one of my own.  And I have a question for the porch.

Does anyone have any knowledge or advice about making a dead bowl into a fine
and living again mallet?