I have an old HO Orient Express set that I need some assistance with.
The front wheel assemby is loose, and i can not figure out how it attaches to the body.  It appears that there should be a plastic arm that fits over the wheel assembly. The 'arm' then would screw to the body.  This was bought a long time ago and has been in storage.

Any suggestions? or a picture/drawing of what that small part may look like?