Howdy!! Newbie here, could y'all kind of take it easy on this old man? Question....have a akm parts kit i want too put together with hex, button head screws. Problem, the 6 holes in the front barrel trunnion, somebody went crazy with too big a bit drilling out the rivets and did not leave me with enough metal too tap for 10x32 screws. What's the next size to drill holes out and what size screws too use?