I was a bit bored so I thought I'd give it a try.... I just now used a penny, nickel, dime and quarter and they all worked on the screw. Watch that little screw, it's a short one.
Worst case you can always ask a cast member, they might have a screwdriver on hand or tell you were to go.
BTW, thanks for asking the question, I had asked the same back before my 1st trip with him. Whew! I'm not the only worrier about *wink*
Happy Spring!