How many of you that use heat shrink holders also balance your tools? We run our finishing tools (6mm,4mm,2mm,1mm ball nose) at 20,000 rpm. We are having issues with surface finish on our Makino F5, and one of the things the techs recommended was balancing our tools. Makino is also recommending we replace our spindle, which we are probably going to do. This thing has been running 2 10 hour shifts for about 4 years, and has survived a few crashes. We are cutting forge dies made from FX material on this machine.