In my great great uncles diary he mentions that a Rabbi Mordechai (Ruzhiner) of Pinsk was a relative of his mother. He doesn't mention the name ZACKHEIM but I understand that the Rav of Pinsk during the mid 19th cent. was Rabbi Mordechai ZACKHEIM who had been born in Ruzhin and died in Pinsk in 1856 (or 59).
I would like to contact anyone who may know about our connection. I've seen George Sackheim's "The Scattered Seeds" which didn't help me very much.
My ancestors who lived in Karlin were Shlomo and Sarah Hinde KANTOR . Shlomo passed away in Karlin around 1860-1870 and Sarah Hinde came to Jerusalem with four orphans. My uncle who wrote the above diary was Chaim Dov KANTOR who is a well known pioneering personality who lived in Shfeya and Zichron Yacov (Israel).
Another uncle of mine (Chaim Dov's nephew) also writes that his Karlin grandparents were relatives of Reb. Chaim of Volozhin who deceased a during the first decades of the 19th century.