Neidhard temperament

Hi -- A friend who tunes for Greate Earlie Musicke Artistes has
gotten a request from one such to tune hpschd and organ, for a
mostly 17th century concert, in Temperament Neidhard 1729. The
only Neidhard tmeperament I have directions for is a very balnd
slight variation on ET, but I have heard of an 'Aaron -- Neidhardt
Modified Meantone', I just don't know the details. Does anybody's
reference library include anything about this?

Judy