Hi Ian,
I too liked the look of that tool, well the insert part of it, so I made my own version.
But as I have a GHT retracting holder already, and forgive the blasphemy, I was not impressed with its benefits so I made it fit a clapper box (also known as a swing up) style threading holder.
Judging by the prices of genuine Ifanger I am glade I made my own.
Just as an aside, I made one of my tangential tools for a Swiss friend who uses Ifanger and apparently it gives a better finish than his home grown and expensive variety, but I have not seen for myself yet., so only hearsay.
chriStephens
PS it was making the insert for this tool that I found how easy it is to mill bog standard bits of HSS with carbide end mills.