I tried to get one out of a case I have laying around.  I warmed up the case on the wood stove and still couldnt budge the insert.  So I gave up.  I will have to figure something else out as the case that I want to use is the one that is missing the insert.  I tried a swing arm pivot bushing and that didn't fit.  SO if anyone has one laying around, let me know. I sure could use one....