OK, thanks for the replies, gentlemen....... 😀
First, let me explain that I've never done a hollow form, and the number of boxes I've made can be counted on my fingers.......so, that's where my reactions to this turner's aid is based upon. (I've never been much interested in making boxes and hollow forms. I'm pretty much a "single minded" turner, and bowls/platters are the only things that do interest me!) My opinion on the torque tamer probably doesn't mean a whole lot to you more experienced box and hollow form turners........😛
It looks to me like the example photo shows the fulcrum, or contact point of the scraper on the tool rest, to be too far from the scraper tip, causing it to be way over extended. The tool rest should be right up to the rim of the box, so it would be better for a more positive hold on the tool. I have a flat-top tool rest for doing boxes, and it extends right into the mouth of the box and provides a more stable base. (I would provide a link, but I see CSUSA no longer sells this flat top tool rest......I might photograph it and post later.)
Presentation is always critical, but much less so when doing the interior of a box....than it is with hollow forms. I can understand why many of the hollow form jigs have "captured" tools for this. Capturing the tool is basically what this "torque tamer" does.
ko