Looks like Griffo had too much time and too much PVC on hand.
The cache is located just out of Lismore at a lovely old country church. It shouldn't be difficult to find and thats the easy part. I found the plans to build this and had to have a go. The trick is to open the lock and sign the log. Retrieving the key could prove rather elusive.
Please be careful handling the contraption and watch where the key goes when it is released (I do have a couple of spares). Please reset the device and replace where found. The logbook must be signed or your log will be deleted.
Please do not place any swag in this cache
Bring your own pencil.