sometimes you need a BIGGER WRENCH this happened to me the other day as I was wrenching and I encountered a nut so large I could hardly wrap the WRENCH I was using around it so I went and got a nice big one with a nice 18" handle and WRENCHED that thing right off.

Then I had the problem of taking the dang thing apart after I took it off and this wasn't a job for the WRENCH sadly, but fortunately I have a vice and together the two of us were able to get it apart in short order.