the last 7 days on my eclipse bcs chuck nut become lose in like half an hour. I tight that chuck nut good, this is happening last 7 days. I use open present handle, so I suspected I unscrewed it unintentionally with my finger dragging against it. I also suspect this is happening cause of vibrations when I pull the triger to the end. My sbs working like it should. Should I order new chuck nut? Any opinions? Maybe try with chuck nut from sbs on bcs?