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In double lacing, the thickness t of flat lacing is

t < 1/40 th length between inner end rivets
t < 1/50 th length between inner end rivets
t < 1/60 th length between inner end rivets
t < 1/70 th length between inner end rivets
none of these.

Correct Answer: t < 1/60 th length between inner end rivets

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