Here is three Brass tubing tubes solder together, the smallest soldering joint I've ever done. It looks a little messy but rest assured it is strong enough to do the job.
Sorry about the images below could find out how to rotate this image. If anyone know how please let me know
The bottom two images are with the aluminum wire that have been glue in with thread locker. Then I added some cotton balls to close up the joints. Which will hopefully stop the aluminum wire from coming loose by moving in the brass tubing. The Cotton ball tightly compact everything together.