I think you'd have to do it using a very light touch. Turn the spindle to shape minus the ball ends then use a parting tool to thin out the spindle on both sides to the diameter of the balls. You should be able to start shaping the balls and leave perhaps an 1/8" diameter of wood on either end holding the spindle in place.
Slowly nibble away at the bits of wood holding the piece on both ends until it drops off. Any remaining flat should be easy to knock off with sandpaper or a chisel once the piece is separated.
That's the approach I'd try.
Slowly nibble away at the bits of wood holding the piece on both ends until it drops off. Any remaining flat should be easy to knock off with sandpaper or a chisel once the piece is separated.
That's the approach I'd try.