Voicing depth

[allen@pengar.com]

Ok, Keith, here is a newbie question.

I've been reading Reblitz about voicing hammers, in which he says to
needle deep on the sides and shallow on the striking surface.  For
deep voicing, he says to have the needle sticking out 3/4", and for
shallow he says to have it sticking out 1/16".  Are those two
distances the depth of the needling, i.e. the needles should go all
the way in?  If not, how deep should they go in?

/Allen