well, if you keep it--you shouldn't feel bad about it. you didn't charge for it, so he gave you what he felt the work was worth.
but if you really feel bad hanging on to it, then i'd just call him and say that while you really appreciate the gesture--the amount was more than you feel comfortable accepting and that xx is more appropriate in your opinion. if he says ok, return the rest to him. but if he insists you keep the full $42, accept it graciously (and the next time he asks for help, tell him upfront that you don't want money or discuss how much you would be willing to accept).
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