ER32 M3 Collet chuck excessive runout.

The end result was I managed to find the sweet spot for the Collet Chuck in the lathe spindle and got the runout down to 0.02mm so was no point trying to improve that. But when I mount the collets they don't run true some are better than others up to 0.08mm runout.
I put the (PC) Chinese 3 jaw chuck back on made it true on the backplate and got under 0.02mm (got to be happy with that) so I am back to the chuck and the collet set will stay in the draw for ballast.
Moral of the story I guess if you buy a $60AU collet set don't expect it to be any good I was very lucky to get a refund.
Thanks for all the replies, I did score a grinder holder out of the exercise as I made one.
 
What kind of collet nut are you using? I switched to ball bearing collet nuts and saw a strong improvement in concentricity. If you take a close look at how a collet is loaded under a tightening collet nut, the cause of misalignment and the cure should both become obvious.
 
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