Helicoid for Hasselblad 200 series...

I am thinking about mount barrel lens for a Hasselblad 200 series camera. Some Chinese firms sell Helicoid such as this one:
http://www.ebay.com/itm/M65x1mm-Scr...Focusing-Helicoid-Adapter-45-95-/252024603552

I confirmed with the seller than the helicoid can move from 45mm to 95mm. The Hasselblad body is ~80mm, so does that mean that this helicoid is suitable for lens between 80 + (~50-~90) mm, or ~130mm - ~170mm?

Thanks!

Thank you for this very interesting link Richard!
You wii be dealing with 125 to 175mm extension to work with.
I did to ask seller some additional questions but it was impossible task. I don't think they even use Goggle translate, nor they understand what they are selling and what can be done with it.
But, it's maybe amazing device in right hands.

my Imagon/Hasselblad helicoid for the 250mm lens, measures from 140 mm to 185 mm from the lens mount.