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Slack line anchors !?! 11-May-2012 At 11:29:32 AM ZERO

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Using fixed anchors, either for slacklines or climbing, requires a bit of common sense and experience.
The other day I witnessed four people rely 100% on 2 fixed bolts.
One was abseiling, so bolts were weighted;
one was seconding, so if he fell the bolts would be further loaded;
the belayer and one other were tied into the same anchors.
The amount of 'biners clipped into the same point and all running at different angles provided the potential for a cross loaded biner under stress.
The two at top had gear on their harnesses but no back ups.
When I suggested not relying on bolts alone for a big group, they reckon it was completely safe.
Good thing it was stellar Arapiles rock and not some manky choss.