Vertical caving terminology and methods > Rigging methods and equipment
A tool used to tighten or loosen spit bolts and through bolts. For spit bolts and M8 through bolts, this is a 13 mm spanner. For M10 through bolts, this is a 17 mm spanner. The spanner is usually tethered to the rigger and derigger's arms with a keeper cord or bungee cord, so that it does not end up making pinging noises all the way down to the pitch base.
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