Paul, I would not ever have thought of that if you hadn't headed in that direction. I had forgotten all about that craft until you brought it up and thank you for the inadvertent clue. Allright, been waiting to get one correct so here goes, HAVE FUN.
That could be anything from a part on a Caterpillar tractor, to a machine tool cog - but I'm certain it's a xenon fine tune adjuster for the cross-hair graticle on a Dalek's vision scope ....
Well, let's see if some others join in and if know one gets close or guesses before I log off tonight I'll post a larger shot of it. This photos is cropped.
naw, leave the photo as-is...the clues are good enough, too...ok...is this part of the weather measuring equipment aboard the U.S. Navy's Storm-chasers P3 Orion?