What is this Dillon part

This part just fell off my Dillon 550b while I was loading some 9mm. Anybody know what it could be, unless it came from one of my Lee dies. I didn't see this on the parts list in the Dillon owners manual anywhere.

http://imageshack.us/a/img9/6444/20121114212442.jpg

What size is it ??
What were you doing when it fell off ?

Put a dime beside it for reference.

If it is smaller than a dime and looks like a top hat, it could be part #18086, the Shoulder Washer that attaches to the Failsafe Rod (#97000). Mine drops off every now and then.

Not sure.....is it possible to take a smaller picture of it?

The powder system has a bowed washer, p/n 14041, that helps hold the bell crank on could that be it?

http://www.dillonhelp.com/manuals/english/Dillon-RL550B-Manual-May-2007.pdf

F. Guffey

Give it time, could be slow to load.

The powder system has a bowed washer, p/n 14041, that helps hold the bell crank on could that be it?

That's exactly what it is.

http://imageshack.us/a/img600/716/dillon550.jpg

I had another powder measure assembly and compared the 2 to see what was different. Should have thought of that first.