When possible put the screw back in the hole it came out of. I also keep some toy magnets I stole from the toy box. He steals them and puts them back in the toys. I'm careful to keep those magnets out of reach when they are loaded with parts. Usually it is very short term and he's not around. Really I should find other magnets but I like those - there is a little magnet on each end. I can put the screws on one end then stick it to what ever I pulled it off of. Keeps things together. Not only does it hold screws but it stands the whole machine on it's side...
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