I am going to get my 9 year old into bow hunting. Heis not strong enough topull back a bow. I was looking at a browning Micro adrenaline xs package (any feed back would be appreciated). Is there something I can buy so that I can pull the bow back and lock it in place and then all he has to do is release it. I think I have saw something like this but not sure. I couldnt find anything on Cabelas website.