One method is to make your own "insert", pick a size bolt that the oversized hole can be tapped to --it might have to be metric, you don't want to go any larger than you have to, screw in the bolt with locktite, cut it off (sometimes I will pre cut the repair bolt so it will twist off when seated, then draw file it flt to the deck, locate the proper place to drill new hole for stock stud and tap the original size
Another place to look is here--
http://fulltorque.com/ffb.htm