秤砣雖小壓千斤 [ㄔㄥˋ ㄊㄨㄛˊ ㄙㄨㄟ ㄒㄧㄠˇ ㄧㄚ ㄑㄧㄢ ㄐㄧㄣ; cheng4 tuo2 sui1 xiao3 ya1 qian1 jin1]
although small, a steelyard weight may tip a hundred pounds (idiom)
apparently insignificant details can have a large impact
for want of a nail the battle was lost
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