This beautifully finished and equipped Quorn was photographed at an exhibition in 2007 and mounts a  rare Quorn accessory - the thread-grinding attachment. The arrangement is not dissimilar to that for thread chasing on a lathe  and uses a master thread and leader - pairs been necessary for each pitch it is desired to produce. Other non-standard features and enhancements include: damping of the motor feet with pads of  a spongy material; elegant knurling on the knobs for releasing the drive belt cover, a satin finish on the ball handles, very fine rotary divisions on the column scale and chemical blacking of fasteners and other parts that would normally have been left as bare steel.
Examples of the thread chasing system on a lathe can be seen here  and here