Strange stretching of mesh when using automatic weights I am using this tutorial.

I've been attempting to work out what exactly is making the mesh snatch onto the original T model instead of moving with it. I'm completely stumped on this one.
The automatic weights didnt paint the entire mesh the way you want it.

You can manually weight paint the mesh 
here is a youtube tutorial:
https://www.youtube.com/watch?v=S0VS0IVylzg

Or just try changing the "bone envelope" and parent the bones to the mesh with automatic bone envelopes

here is a tutorial:https://www.youtube.com/watch?v=wBLv6oa60_k

But either way you will probably want to tweak it to make it perfect by manually weight painting a little