Hi, Just give us a call or email later on using the contact detials in my signature below and we can arrange to get the correct screw out to you this afternoon in the post.
All we will need to know is what store did your kit come from (if it was not our own) and your address detials to send it to....
Very odd that a part is missing or wrong, but like everything else NOT impossible when all of the kits are packed by human hands. We will give Chazz a slap for that error and blame him regardless......
Best Wishes
Darren, X-Factory UK