Metal head upgrade / thread not holding screw

[Limo2005]

New metal upgrade was included in the package that I bought and I have assembled, only to find that one of the screws (IN GREEN) securing the flybar to the main rotor, cannot be tighten because the thread (RED), is too large. I mean the screw falls out it if tilted sideways. the other is tight!

How do I go about solving this? Larger screw? Small bolt seems to be logical to me but where would I get one? Local model shop? The head is not mounted yet, so it's portable.

Ideally I would like to get the part replaced, and unable to get part replaced from the seller. Is it possible to order separately?

Mickey