I just ran across your old post. I too have ancestors from Heinstert: Anna Margaret RICHARD, b. 1812 in Heinstert, d. 1896 in Buffalo, Erie County, New York, USA, and Jean Nicholas PERRY (PIERRET), b. 3 Dec 1808 in Heinstert, d. 21 Sep 1895 in North Java, Wyoming County, New York, USA.
If you still have sources in Heinstert who are willingly to correspond, I would enjoy making contact with them. Thanks.