Rav Shach letter

Yudel Shain is trying to locate a letter written by Rav Shach: There is a letter from מרן רב ש"ך זצ"ל regarding what are the responsibilities of a ראש ישיבה as far as the "shtuht" and a Yeshivah located in that "Shtuht"- Should any focus be put on the "shtuht" and their needs etc, or just the Torah & the Yeshiva?Any body that can provide that letter will be appreciated.Please send to P. O. Box 172, Lakewood, NJ 08701-0172Please mark envelope CONFIDENTIAL.