I need to disassemble the Plunge Depth rod on my PC 890 in order to reinstall the indicator which broke and fell off. I used superglue to repair it, but off the rod (because if the superglue escaped to the rod I'd be in REAL trouble). Now I need to get the indicator back onto the rod, but the rod has to come out of the base to do that. This means removing the black knob on top, but it does not appear to be threaded on. Has anyone removed this knob and successfully reinstalled it?