B42 collet runout

I have a Quick Tech ATM 20Slathe that uses B42 collets. These are the push to lock kind. Runout of spindle bore is probably a couple of microns and the sleeve that closes the collets is pretty much the same. Good quality collets are being used. Put a part in and the runout can be up to .07mm TIR so around .035mm off centre although I have just clamped a 3/4" part in the lathe and there is .02mm TIR which was a pleasant surprise. For those that use these type of collets what kind of...

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