How to reseat the extruder spring?

With great difficulty.
I managed to do it by first making a slight divot in the plastic lever where that end of the spring sits, then you line up the other end with the slot it goes into (it runs vertically), with the piece of metal that holds it all together almost horizontal and twist the piece of metal anticlockwise.  To keep the end of the spring that sits in the metal from popping out, I used a flat end screwdriver.  You have to watch the bearing doesn't get stuck on the feeder wheel too or you'll have to start again.

Before putting it all together, I suggest making sure the worm in the extruder wheel is tightened well down... mine came from the factory very loose.  Also, watch the wires ont he left go through the right place. One of my heater wires came clamped between the two pieces of metal in that area from factory... it seems ok so far, but not really happy about that either.

BTW... I've pulled that apart 3 times so far for different reasons. Almost an expert at it now.

Regarding 'worm', I'm probably not using the correct term.  I mean the little hex screw that holds the extruder wheel on the motor shaft.  I don't think there is locktite on anything in this printer.
Once you have the divot for the plastic end of the spring, you can actually screw the screw that goes through the spring in a couple of turns, but you will still need to hold the end of the spring in the metal in place as you fidget to get the bearing past the extruder wheel.
Good luck!

Edit: It's called a Grub screw. :-D

http://www.soliforum.com/topic/9363/hel … eassembly/

I finally got it on. Not recommeded for anyone to take that off. I also have built my own delta printer from scratch and that was definitely the most tedious and terribly designed thing I've come across. Thanks for the help everyone.