i did exactly the same to get my elbow on too... good ol' angle grinder to make a mini spanner!
and like said, after nippin' off a couple threads on that lower stud... the nut is a PITA to get on... once it's on, it's simple... but it's just gettin' it started!
and like said, after nippin' off a couple threads on that lower stud... the nut is a PITA to get on... once it's on, it's simple... but it's just gettin' it started!