Yesterday I found your posting in the genealogy forum, so I looked it up in the "Ortssippenbuch" of Britzingen.
Muggardt contains to the Parish of Britzingen and the "Ortssippenbuch" contains all people who were born, married or died in the Parish of Britzingen since 1607 until 1972.
I am sorry, but I do not found the name Leinenweber or Arens in it. In your posting you wrote that Muggardt is in Westphalien but Muggardt is in Baden. And there is only one Muggardt in Germany. Maybe this is the key.
Greetings from Germany and have a nice week. Thomas Merz