Dec 2007/Jan 2008. / Detail of a wall bolt showing the square washer and lock-nut.
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Each bolt has a square washer which has holes for screws to prevent it turning once installed. Each required a lock-nut. For almost all of the bolts (except those we bought locally) I measured the length and wrote it on the washer when assembling, to make it easier to identify which was which on the actual build.