Linkable double spool system

This is a derivative of:
http://www.thingiverse.com/thing:4337 by randyy

There were several things I didn't like about this. The first is the spool was too small, so my filament would just unwind itself. The second was that I didn't have any rods to go between the spools. Finally, the hole in the middle was too small for the rod I wanted to but it on.

So what did I do?
Made it extend-able, so the size of the spool can be changed.
Made the center hole bigger.
Made it so I could attache