Tactical Error - There ARE times when lube is a bad thing...

@eugene13 - Yeah, it's layout. Didn't realize there was more than one kind. I'll get some Prussian Blue.

@Bob Korves - Thanks, I'll try that with the Prussian Blue.

@derf - Thanks for the input. I don't have any other machines that can handle either approach you mentioned. I'll re-check as mentioned above and see what can be done.
 
Then you have tools that will get the job done. Scribe a circle on the bottom of the compound, the outside 1/2". Use the die grinder to relieve everything inside the circle. It wont take much.
 
An ancient one. Also have die grinders and 3M Roloc Scotchbrite-type abrasive discs in various grades.
You'd be better off with with a piece of flat stock and wrap sandpaper around it. You want to take off minimal material and be able the control it. It appears the perimeter has been filed in some places. Which look like low spots in the pic.
 
What about using grinding compound and twisting the two parts together...
You would need to clean it up real good when finished....
 
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