I have been hoping to understand the approach of Rav shach in removal of objects that can cause damage, but (outside of some basic ideas) I have not gotten far. I have a local beit midrash within walking distance so I have been able to look at the gemara Bava batra page 18 and one of Rav shmuel Rozovski's books on bava Batra. [[I think one volume of his is missing] I think I need to continue in this subject, but I have to say that the small pamphlet on this subject in Rav shach's avi ezri is still a mystery to me