[Avodah] Zilzul: Parameters

[rabbirichwolpoe at gmail.com]

One of my chaveirim was pointed out that a certain professor was mezalzal
hazal re: peshat on when to start sefira and essentially held that the
tzadoqim were correct...

OTOH, this fellow seemed to feel it is ok to me mezalzel many minhaggim
that he construed as minhag ta'ut.

There are also cases when:
Rambam picked on Behag
Ra'avad picked on Rambam
Re'ah picked on Rashba, etc.  They were not always congenial...

Q: When is it kosher to be mezalzel and when is it not? IOW what are
the parameters?

KT
RRW
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