yes this has been covered many times here, but I don't mind recurring issues as we may all learn again and possibbly better.
As mentioned it is likely the head of the bolt to the filter housing where the stick is. So you can grind that off, remove the cover, and the rest of the bolt should come out easily.
This item is one of many i class as "squishable". The drain bolts, tappet caps, spark plugs, and this bolt, should be tightened snug, then a slight bit more, to squish the Oring or crush washer they have. Why people crank on these ill never know. Tighten down to snug, then squish and stop. If it leaks, squish a bit more. Anti seize couldn't hurt.