Just wondering how the majority level the bed/table of their CNC machine? ....does anyone use a fly cutter? If so, what spindle are you using with it (because I'm figuring that the chinese spindle's RPM don't go low enough & fly cutter would likely stress the bearings.....not to mention being dangerous!)

Looking at you tube videos, the end finish seems far superior when using a fly cutter (vs say a 6mm endmill to level the bed)