Quoted from RabidBunny:Joined too. One of the legs does not keep the bolts in tight. Think of just adding nuts in side to properly secure. Also need to fix 4 switches and one place the ball doesn't pop out correctly (left lower side above slot leading to flipper. Also need to find right clip to keep back securely in place. Will need to clean inside. Looks like I have a new hobby (it is my first pinball machine). Played 15 games tonight. Once leg is attached better will level again.
You just need one of these.
http://www.pinballlife.com/index.php?p=product&id=144
It's what the leg bolts screw into. Yours is stripped and it's really common. Easy to put in. Just 6 screws. No need to take out a play field or anything. It'll be better than new.