I know that when building an eruv, the string has to go over the top of the lechi (pole/upright). This document had some great illustrations. I'm just curious, which method is most durable? Which ...
I know people do this (if there's no eruv in town, or if you're afraid the eruv will be down at the end of a 3-day yomtov); I think it involves a string from the sukkah to the house? Please explain. ...