This is the next-to-the-last step in making the micro ferrules.  Bamboo rod making in its advanced stages has the rodmaker experimenting with many variables.  Shorter ferrules or micro ferrules, is a good example.  In addition to weight savings, micro ferrules tend to minimize the dead spot in a bamboo fly rod at the ferrule station.

In this video, the female tube, with welt, is soldered to the male:

[youtube]http://www.youtube.com/watch?v=xzJiXJWzcmU[/youtube]

The final video in this series will be the fitting of the male ferrule to the female.  Stay tuned.