Just got regards from someone who credits me coming to put on tefillin with him (I don't recall using the term "wrap" back then) on Fridays 38 years ago, for him being שומר תומ"צ nowadays. (He came a very long way, was married to a non-Jewish girl back then!). Every few years someone meets him and comes to me with regards and credit from him.
His description of me excludes the prefix Ex.