Merge external (in)complete file to already running torrent

The image show two different torrents with the same content where the availability is less the 100%. You can see in the image that if you combine the parts you have a 100% of the content. (http://imgur.com/Fw6VyEZ)

Here a feature of merging the contents comes in, as this is the only way to get all of the torrent content (complete the torrent).

There are two ways of merging the torrents manually:

1. You open a second BitTorrent client and become your own "Peer/Seed" (complicated).
2. You stop one of the torrents delete/rename the file. Copy the other torrent's file to the stopped torrents destination folder (rename the file if needed) and "force recheck". You can now download the missing parts/seed. This will delete the progress of one of the torrents if it is incomplete but you might get the missing parts.

Notes: If you have one complete file and you just want to seed it to the incomplete peers, option nr.2 is best. If you have two or more incomplete files of the same file, option nr.1 is best.