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Slack line anchors !?! 11-May-2012 At 8:26:18 AM tris

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If these bolts are the ones I am thinking of (Green lane) then they are ones which I put in.

They are two 10mm U bolts placed in good rock (for Brooyar). They were placed specifically for this purpose, however they were never intended to be used by themselves.

For the set up I did when I was in Australia (I am currently living in Canada, which is why I appear to be posting at 3am) my backup line (10.1mm dynamic rope) ran from a very large gum tree, down to the two U bolts where they connected to both bolts using a butterfly knot clipped to a sling tied as a sliding X which was connected to the bolts. I used Steele biners for these connections or doubled and opposed aluminium biners. The rope then ran across the chasm to the massive 16mm (or are they 18mm) ring bolts placed by the national parks service. I would connect into two of these using a cordalette which in turn connected to the rope using a butterfly knot. The rope then ran up the hill and terminated at another large gum tree.

The rope stretching across the chasm was hand tensioned (just so it would not sag), the slackline was attached to separate slings (i.e. not the ones which anchored the rope). The rope and the slackline were then taped together using finger tape at about 1-1.5m intervals.

The walker would tie into a ~1.5m 11mm dynamic rope which would tie into two steele rap rings which the slackline and the backup line would run through (you don't want to use carabiners as they can cross load or snag).

The entire setup, including the bolts which I placed, was inspected before we walked, during the session and after the session. I never saw any sign of damage or cracking of the rock.

I hope that clears things up a bit, I did quite a lot of research into this setup before doing it. The bolts are incredibly well camouflaged, to the extent that even I have trouble spotting them from the ground.