Got a lathe? You'll like this lathe attachment for a live end boring bar.
Rather than offset the lathe tailstock when turning tapers, after it has been adjusted to accurately turn work between centers, make up an offset center as shown in sketch.
This can be quickly set at any position from zero to .625 in. on either side of center, allowing tapers to be turned with either the large or small end at the tailstock of the lathe.