clearance
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Gaffing out is only scary when you are free climbing, done it before a couple of times. As far as gaffing out when your steelcore is around the tree, it is no big deal if you are just climbing and not running a saw. You will spur back in after a couple of feet as long as you are climbing properly (like people have told you here). When you are pushing of the top with one hand and one hand on your 020, make sure that your spurs are stomped in real good.