looking for a screw from the manfrotto 055 tripod

[jac]

when i bought the 055CLB couple of weeks ago, saw that it had 3 screws on it..

then when i bought the 055Pro last week, when i wanted to fix the head on it, i saw that there were only 2 screws on it... thought i had dropped it along the way or something.

i use it for video work.. so need to make sure the head is secure.

thanks anyway.. will go those hardware shop to get one.