I've researched this line too. See my website
www.knegtel.tk or
http://members.lycos.nl/familieknegtel/ for other names.
In January 2006 the KNACHEL line will be published there too. I've some Knochel's whose lastname became Knachel in my database.
Familynames like KNECHTEL - KNECHEL - KNICHEL - KNICHTEL - KNEGTEL - KNECHTL - KNEHTL - KNECHTLI - KNECHTLY - KNETCHEL - KNESHTEL - KNECHTLIN - KNOCHEL - KNACHEL are all related. Most of the name changes are due to mistakes when writing the name or because they went to another country and they changed the name regarding the use of names. So Knechtel became in Switserland Knechtli or Knechtly and in Holland it became Knegtel. Somethimes they 'dropped' a letter.
Peter Knegtel
The Netherlands