Say fellas, I fought again this morning with sloppy or slipping depth settings on my PC 890 in the plunge base. I set the depth I need using my little brass 3/16 (for eample) bar. Start my router cut, plunge, and the ^%$%& cut will go way deeper than I've set it! I've zeroed router before setting depth etc. and screwed the lock knob as hard tight as I dare. Whats going on here? :'(