Hello Torsten,
It seems this product exist for decade already. it's made in germany. I know rotary table manufacturer that are using it to get the highest precision possible.
You may find information and drawbar on Allytech's website (it's a ".eu")
http://www.allytech.eu/index_fichier...dwormwheel.htm
to have better accuracy and power transfer they do make high teeth. there for the line of action seems to be very good.
Hope this helps