There really arent screw kits made for exact games.
However, if you look in your manual, youll find the sizes you need, and companies like Pinball Life, Marcos, and others will
have them to order alacarte. Order Extra.....If you dont have magnetic drivers, they are a big help.
I saw some on PBL on sale, or I use cheapy Harbor Freight, and glue a small round rare magnet inside...
If there is only a light oxidation, light tumbling/polishing wont remove the plating. If they are rusted, they are gone,