Kirk Eppler wrote: "I have at least one in the shop now where the taper wobbles
in the socket,
and there is a recess where the flange on the taper ripped up the wood.
Unfortunately, my lathe skills may need brushing up before I attempt this."
You'll probably get a better fit by scraping in. without extending the tenon.
Cut a sixteenth or an eighth inch  or more off the end of the tenon, and whittle
back the shoulder of the handle the same distance. Put the handle in the socket,
align it to get good straightness, and wiggle the handle around a bit. The dirt
from the socket will offset onto the tenon and will, at first, show you where
you have to trim back.  Later you will have to use a little scrap of carbon
paper wrapped around the tenon. Set register marks so that you can put the
handle back into the socket in the same orientation each time; you don't want to
rotate the handle in the socket as you transfer carbon, since the socket is
probably oval or bumpy on the inside---especially if it is a welded socket, not
a forged one. 've done this many times; I usually fit by scraping in even if
I've made an entirely new handle.

Tom Conroy
Berkeley