Where it is customary to do work on the eve of Pesach until midday, we may do [work], [but] where it is customary not to do [work], we may not do [work].  [If] one goes from where they do [work] to where they do not, or from where they do not to where they do, we lay upon him the stringencies of the place which he has left and the stringencies of the place to which he has gone. But let no man deviate [from local custom], to avoid conflict.