Accu Chuck For Sioux 680 Valve Grinding Machine

20141110i have used several sioux valve grinders before and i have never been able to get them to grind concentric. i have ground brand new valves and reinstalled them 180degrees and they sound like a bent valve. i like the rest of the sioux valve grinding machine. it is very well built i just cannot get any luck with the sioux chucks.

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