Reply To: The definition of Kulos/Chumros and the psak halachah.

NOt to rely on an eruv, Reb Shlomo Zalman in Halichos Shlomo on pesach by gebrokts, is maarich about the chiluk of a minhag and some chumrus. His example of an extreme chumra is to not rely on eruvs. He says if one is makpid on this his son is not mechuyav to follow since there is no reason meikar hadin not to use an eruv. There are many complex issues that can go wrong while making an eruv, which might make one extra nervous, but nobody holds that there is no such thing.