Cheap Reversible Threading Attachment?

[magicniner]

I use my red vertex if I have a lot of large holes to tap, it adds about eight inches plus tooling under the quill and the reverse isn't very sensitive, I use it on a floor standing mill drill that's bigger than me so clearance, sensitivity and power aren't issues.
There are a lot of good solutions using arms resembling angle-poise lamps that allow the use of electric or pneumatic tools and the only dedicated bench space is the arm mounting point,

- Nick