I would get new eccentrics...
It's been my experience that new eccentrics are a lot easier to fine tune - presumably because they don't have a worn spot right where you're trying to set them. When I got new ones on my 91 535: 1) they were easier to adjust, i.e., more linear in terms of adjustment and response, and 2) they were quieter.
I think they are quieter when they are all adjusted the same... so it may not be that new eccentrics themselves make it quiet, but new eccentrics made it possible to get them all just right, and hence, quiet. Get the bolts and nuts while you're at it.
Some on this board have built a bump starter that speeds up the process quite a bit:
http://www.bimmer.info/forum/showthr...49790#poststop
I haven't built one yet but plan to before the next VJ.
HTH
Robin
72 Chevy K10
01 E39 M5