Leon wrote:
"J. Clarke" wrote in message
...

Are you saying that the properties of wood have changed so radically
in the
last 30 years that lag screws hold differently in them now?

Well yes actually. Wood with wider growth rings as oppose to
narrower more compact gowth rings, which were more available many
years back, may yield different results today.

Won't that be reflected in the density though?

Because the
recommendations are not about allowing you to use crap screws without
breaking them while driving, they are about sticking wood together
so it stays stuck.