The convergent evolution between this and the 10EE is pretty striking.


The Rivett has an additional bearing in the middle, hence the longer spindle.

IIRC, the Rivett has an L-type mount whereas the Monarch has a D1-3 mount (the
smallest in the Camlock series).

Not sure if the Rivett can do any better than 5C collets, though.

If not, the Rivett just has a stiffer spindle, although the Monarch's spindle
is certainly plenty stiff.

For some other interesting similarities, check out the CVA toolroom lathe.