I think this has run it’s course now. The great reveal🎤🤫
It is for recutting the valve face seal for engine valves.
The valve is held in the jaws and moved forward with the fine screw thread against the cutter. It is then rotated by the handle clamped to the valve stem until a smooth shiny seat is formed. It sounds quite ‘agricultural’ but I can assure you it works. Think. BMC, Ford and earlier vehicles.
I am sure it would not work on moder very hard engine valves.
Would you like another one ?? NO. as Pompey– says. I will get my coat.😁
