Hi there, I am working on a bridge repair project and the bolts used are being pretensioned with the turn of the nut method (1/3 turn). The contractor was meant to use fully threaded M20s but they ran out so they decided to use M22s with a shank. The shank was too long so in order to space the bolt correctly they used two square spacers under the bolt head and two washers on the other side. My boss has told me not to allow double washers. When I was asked on site by the workers why not, I wasn't able to give them a proper answer. Can you please provide an explanation as to why double washers should never be used?
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