You preload the spring before youthread the rope thru the housing and put the pull handle on the rope.
Here, try these 2 vids. I didn't have time to watch them all the way thru, but IIRC he does a decent job. :
Part 2 may be all you need since you have it apart already:
ETA: Beat by the veteran atv'er!!!
Howdy, what about a pinned post (can't think of the proper term :P) with one or all of these vids?