picked up an Exposure 3010s2d, missing C14 screw (size request) and tape monitor switch?

Hi everyone.  Just unpacked an exposure 3010s2d and I heard something rattling in the case.  It was the very small nut that holds the small black flathead inward flanged screw that bolts the C14 male connector to the chassis for the removable power cord.  Is there a standard size / model for this screw?  An online search didn't turn up much.

Also, is there a remote button combo that puts the Tape Play and Tape Record into a tape monitor loop mode?

Thanks,

Scott