My table was a bit loose when I bought my boat last year. You can try larger screws if you can't re-tighten the old ones. Another thing that you can do is put either a glued golf tee into the hole if it's large enough and let it dry. Drill it out to the size screw you have and put it back in. If the hole isn't large enough for a tee, you can stuff glued toothpicks into the hole and drill them when they dry.