Wanted: O.S. Max .10 "Bow Tie" Engine for Parts

I was wondering if someone might have a junked out, vintage O.S. Max .10 engine or pieces they may be willing to part with.

Top Dawg's .10 lost the stepped screw from its bow tie exhaust restricter while on the test stand (followed by an extensive search with no results).  It was replaced with one from my other .10.

THEN, at Summer S.M.A.L.L., its needle valve assembly fell out or unscrewed itself, and was lost over Sky Tiger Field.

So, I need this stepped screw and vintage needle assembly shown in the photo.  It's bugging me to have a semi-cannibalized O.S. parked in the drawer, so please shoot me a note if you have one of these old engines, or parts, I could buy.

Cannibal Kim