Vertical shear finishing tool for the lathe - video

[NortonDommi]

I have a couple of those Eccentric Engineering tangential tools and find they do an excellent job as a shear tool when used in reverse i.e. with a RH tool instead of running towards the headstock cut towards the tailstock and vice versa for a LH tool.
The bit could also be turned through 90 degrees to achieve the same result, I have been means to make a dedicated tool though.