There's a woodworker's list that has periodly discussed this issue in detail.
I've been off that list for some time now, but you might consider subscribing
to WOODWORK@IPFWVM.BITNET long enough to ask there for the best update, or
doing a search of their FAQ's and archives. They've been quite detailed in
their discussion.
Hope it's helpful.
Charlie Griffin
cgriffin@ksuvm.ksu.edu