by gofaster » Fri Dec 09, 2005 10:11 pm
Larry,
MSC and J&L have 1/2" shank collet holders and extensions in ER-11, SA, and DA (SA single angle collet, DA double angle) with total indicated runout within 0.0005". If you only need to adapt for one or two sizes of valve stems, this may be more cost efficient than a whole set. They list some DA collets in metric specific sizes, too. I think Ericksons just come in 1/64" increments.
Jim