Re-Attaching Parts...

I don't normally mod my TFs unless something is really bugging me, in this case, Movie Blackout's tail. It interferes with posing. Despite being removable, it was connected to his iconic helicopter blade 'cape.' As you may have guessed, I decided lopping it off was a good idea. Like so:

What an improvement! That tail could seriously have been it's own bot.
....however, the tail can't reattach for helicopter mode -- I had confused the holes that the cage connects to for connecting to Blackout's legs. Oops.
I'd like to re-attach the tail for copter mode, but not permanently (i.e. I don't want to just glue it back on). What's an easy way to do so? The tail and the part it was connected to are now hollow (they had a number of plastic gears inside), roughly 6mm by 17mm.

What an improvement! That tail could seriously have been it's own bot.
....however, the tail can't reattach for helicopter mode -- I had confused the holes that the cage connects to for connecting to Blackout's legs. Oops.
I'd like to re-attach the tail for copter mode, but not permanently (i.e. I don't want to just glue it back on). What's an easy way to do so? The tail and the part it was connected to are now hollow (they had a number of plastic gears inside), roughly 6mm by 17mm.