Viel scissors sharpening question

[grepper]

Do any of you Viel owners sharpen scissors with it's new scissors sharpening arm/clamp or the Twice as Sharp arm/clamp?

Is there some sort of adapter allowing use of the Twice as Sharp arm/clamp tool?

With either the Viel or TaS scissors clamp, how well does it work? 

With it, do you do scissors on or off platen?  

Thanks.