oil sump

Hello guys I'm facing an issue where when I want to change the oil filter, the oil sump adapter comes loose meaning I can't remove the filter it is stuck because the previous owner had some issues. I then go to the dealership to find the set screw because I couldn't get ahold of a new one. The...

Was just changing my dipstick tube as the old one snapped in half. A couple/few bits of the plastic crumbled off down the tube into the sump. The bits were only 1-5mm big. I'm thinking shouldn't be much of a problem - will either melt or get crushed up if they make it past the pick up/oil...