Originally Posted by ger21  I think it's 5/8.
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several years ago Precisecut (now Precisebits) was selling an accessory collet for a Porter Cable laminate trimmer that had a runout spec of less than .001. The laminate trimmer itself without the P/C collets has an excellent runout if the bearings are in good shape. They stopped selling this collet because the job shop they had hired did a crap job on the last batch because the job shop had a new owner with an 'attitude'. They didn't want to do 100% inspection so they pulled the product. If anybody knows a machine shop that would do a high quality job we could probably get the Precisebits head guy to license the design.
BTW, Precisebits just announced a precision 1/4" to 1/8" sleeve. The target is to allow their microtools to be used in a Carvewright.
-James