picture
Thanks everyone for you comments - here is a picture of the problem bolt - the lower one in the picture. As you can see the grease fitting comes in at the side and not in the actual bolt.
The consensus seems to be that it is simply driven in, not screwed in. I did find a small hole (~3/8) through the frame lined up with the bolt - it had been filled with muck -- and so I thought "great now it will be easy with a drift to drive it out"! I had taken up the weight off the spring so the spring moves along the bushing a few mm each way by a finger touch.
Not so fast! Even with heat, soaking in Liquid Wrench for several days and using a 5 pound hammer on the drift, it has not budged a fraction. I tried turning it by carefully driving on the outer slot but no luck either.
Anyway - here's the picture of the *!##@* thing!
David
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