[R-390] Need R-390A Iron Core Slug

[Charlie Hugg - K5MBX]

I was trying to adjust a sticky slug in my  R-390A RF Deck and it broke. Does anyone have a parts receiver with a 
a powdered iron core with top adjustment screw and spring link for the 2.0-4.0MC Slug? The is the back slug 
marked Z203. Will any other slug core work from other parts of the RF Deck? How does one go about getting the 
bottom end of the old core out?
Thanks, Charlie Hugg, K5MBX