Hi Peter,
I got the centers off Arceurotrade one 60 deg hardened dead center and one medium revolving center which I am a bit confused with as far as lubrication is concerned. You can unscrew the end cap at the tailstock end to lubricate it and it has a seal at the front end of it which you can undo I guess you put graphite grease in the end but have also seen a very similar revolving center on u tube if not the same where the person recommended using 90 weight gear oil.
Tried to drill out bushings with a center drill but my center drill is far too small so might have to get an other one. I have had a look on Dan's website for his bushings but maybe this project never went ahead.
Its a cracking day up here and have promised to take Mrs Bob and my cameras out on a trip so more later.