Hi Stig,
My source for Sewing being Kdre. NJG 101 is
http://www.ww2.dk/air/njagd/njg101.htm
It may well be wrong. Whilst the site is excellent there are some errors.
Dates also differ on Franz Evers as Kdre. NJG 102
http://www.ww2.dk/air/njagd/njg102.htm
Best Regards
Andy Fletcher