@msh210 This Shabbos, I was looking at
Bei'ur Halacha on 302:9, s.v. "מותר". The Chafetz Chaim uses a Y'rushalmi in Shabbos (
7:2, about laundering asbestos fabric by throwing it in the fire) to help resolve an apparent conflict between a comment by the
Tif'eres Yisra'el and a mishna in
Shabbos about
m'labein on Shabbos. I wouldn't be surprised if this Y'rushalmi occurred to Dr. Kalikstein ז"ל as he was forced to labor in that asbestos factory.