Installing GBB air nozzle spring (TM 5-7)

[krap101]

Hey guys,

I'm having trouble installing the air nozzle return spring (that's what I'm assuming it is). It's long and one side is tapered. It looks like it goes in between two "protrusions", and there's a little ledge there, but I've gone through three of these springs, and they always fall off while getting the group back into the slide and get bent. Any suggestions?

Thanks

For reference, it's the long spring, second from left