Mike,  I think you will find the information you need about the Welte
(Licensee) transforming lever here:

  http://www.mmdigest.com/Archives/Digests/201207/2012.07.07.06.html
and
  http://www.mmdigest.com/Archives/Digests/201403/2014.03.07.03.html

Good luck!

John Grant