There's only one screw and it is one of those 3 way deals, I don't have that kind of screw driver, but I can kind of manipulate it with my smallest flathead at an angle.
The rattling doesn't affect gameplay but since I'm cleaning it up and trying to make it my own, I was wondering which part was probably rattling, and if it was worth trying to find a little 3 way screw driver to open 'er up and see what the deal is, or what it could be, like the battery maybe, because it looks fine from the outside.
And what the heck causes something to rattle in a cart, its my first time hearing this.
Sorry so long, thanks.

SAY ALLO TO MY LITTLE FRIEND!!!i finally used google!!