Remember you need either open end , boxed end --OR ---DEEP well sockets in 5mm, 5.5mm, 6mm or 1/4 inch to cover all NVA
In a pinch, withOUT the right size, I always reach for the small flat duck bill pliers and NOT the Needle nose
I have a few sets of small flat duck bill pliers that have been ground down to grab the NUT and hold it at the spray hole angle needed while I tighten the shebang firm
I have several sockets (deep style that are NOT deep enough) I was able to chuck up a drill, slightly smaller than the flats, and bored deeper to allow clearance for the fuel nipple length
Spring Ratchet type NV holders are a PITA!