Hi, Sorry to say the trip has been cancelled – Weather has conspired to make the trip unworkable. We will try to run a mini trip later this year when the weather has improved.

Another discussion on rope aging…
https://www.climberswa.asn.au/topic/when-to-retire-a-rope/

Gyms use Hex bolts.
I have seen in the park Tamper Proof Torx bolts used on those giant net playground things.
Torx are a star like pattern and the tamper proof design has a pin in the centre of the hole to make it harder for someone to undo it without the right tool.
See… http://en.wikipedia.org/wiki/Torx