If the weather is fine I've been using a mixture of 50% flour 50% icing sugar (a lot brighter in colour than flour) and a shake of cinnamon. This seems to work well for me. With your hand smear it up the tree trunk from about shin height to shoulder height. I guess having the larger smear makes it easier to see from a distance etc.
If wet I used a paste made up of the same thing but with a bit of water added. I have this is a squirt bottle that I squirt onto the tree. This just makes everything cleaner as you don't end up with your hands stuck together with all the dried flour mix.
Set your trap about a hand width out from the tree base directly under your flour/paste smear
By nailing your chain end up the trunk a bit you can reduce the amount of leverage that a possum can put on the chain. i.e. when the try and run off it will lift the leg off the ground so they are in 3 wheel drive sooner rather than getting a longer run up.
When you dispatch them by hitting them with the hammer, if you want to try and be a one strike hero, do so at your peril.....I always give them a few more just to make sure they don't wake up!
Good luck and any questions sing out.
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