You can also scattered leaves, dirt and small branches on the bottom of the trap, to make it seem more like the outside environment that O'Malley is use to.
Oh I've been wondering how you've been getting on with O'Malley, I know only too well the feeling of apprehension to get them go into the trap, and the joy relief and panic when they finally do!
I recently had to catch a cat that wouldn't go near a trap, we ended up ticing him in to a shed through a small pop hole and had a little guillotine style drop door held up by string that we dropped when he went in for food. We then had the problem of getting him in a carrier though, and I don't think I'd have managed if I didn't have my daughter to help.
I'm sure O'Malley will go into the trap eventually, it is wonderful that you are helping him, good luck Frank!
Yes, O'Malley does know you're trying to help him, but caution and self-preservation is deep-seated in the nature of feral cats, so although he wants help, it's difficult for him to receive it. Cats are perceptive, though, so don't doubt for a minute that he knows you care for him. It's also possible that he's been trapped before or has seen other cats trapped, and ferals have a long memory when it comes to that sort of thing. I've never had to withhold food from a cat to trap it, and I won't do that, ever. I've managed to trap cats by putting food into the trap that is tastier than the regular food I give. Many cats can't resist chicken, especially when it's heated up and in broth, but every cat is different.
I hope that if you're unable to trap O'Malley that his paw will begin to heal on its own. I know how difficult this is for you. My outdoor feral had an injury to his ear in February--something bit it-- and it got infected within 24 hours. He seemed to be in terrible pain but I couldn't trap him or clean it (except to spray wound cleaner on it). My vet prescribed liquid antibiotics that have no scent or taste, and I was able to put it into his food each day, and that saved his life--but I sure suffered along with him during the entire ordeal. I'm sending my prayers out for both of you.