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Old 17th December 2018, 10:24 PM   #4
kronckew
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Join Date: Mar 2006
Location: Room 101, Glos. UK
Posts: 4,150
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Mason's string tools. used either end of a brick run to enable a string between them to ensure the run was straight. Usually there are two. I've got a couple somewhere made of aluminum, also about 5 in. Points & edges are sharp.
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