I made an expensive error the first time I tried to set my 500 points.
I convinced myself that the central lobe must be worn as I just could not get the 2-3 points set correctly.
As the centre bolt was in poor condition I bought a DS replacement lobe and bolt.
Of course it made no difference at all, I replaced the Tec base plate that came with good Tec points from Steve at 400 spares. I set them without any difficulty. My plan was to change to electronic ignition once the 500 was run in, I'll stick with the points this time.