Sam2 Kezais is a unit of volume, not weight. There is actually a Iggeres of the Chazon Ish wherein he says that the kezais is the size of the normal olive in any place and at any time. Given the size of the medium big olive in EY, and erring way to side of caution, there are shittos that put the measurement at 20 ml, or the outside volume of two soda bottle caps, or that of a small matchbox. The Rogochover Gaon, when asked, demonstrated the size with the top digit of his index finger. We have no reason to assume he was built like Og m.h.
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