I have an oil leak.  Oil is dripping off the outside of the road draft tube.  It seems to be coming from around the base of the filter.  I'm not sure how to remove the filter.
There appears to be a hold down bolt (?) on top of the filter but I can't turn it by hand and don't want to wreck it by trying some other means ie: slip joint pliers or worse.  

How do I get the filter off and stop the leak??