A quick question back at you: back when I was working around Hueys, we used quick pins to install the troop seats in the back. You set-up the seat frames and push the pin in to lock the seat parts in place, then pull the ring (or push the pin center shaft) to release the lock-ball on the pin shank, then you could pull the pin out and take the seats apart. Otherwise, the pin was firmly locked in the hole securing the seat frames. Do you use such things? If so, it occurs to me those might be something to consider for attaching bag rails.
It was tons easier than having to wrench nuts and bolts everytime you had to reconfigure the back from seats to stretchers, etc.
If not... never mind.
