I use one.... It' s called my LEFT hand.

OK.ok... I also screw 2 into the tree(one against the trunk above the seat so when I sit facing the tree it' s in front of me, the other on the right side as you look at the tree) I also have an API stand which allows me to lay my bow with arrow on the string across the wrap around hand section of my climber. I also have a bow holster on my belt that I rest the bottom cam in when I' m holding the bow with my hand. That gives me 4 options and if I have an overhanging limb or am in my favortie situation(a double or triple tree) I screw a bow holder into the other tree for a fifth option. I distrust myself with a bow holder attached to my stand.