I’m sorry you cant find the Reb Chaim. I think Reb Moshe Sternbauch brings it down. It makes total sense you just have a wrong version of it. This is not the Chacham Echad from the Radziner.
Truth be told however the mishna berua by ?????? does disagree and i dont think the Reb Chaim is normative ????. Also the Briskers are the ones that take 20 ???????.