The shops will also charge up to $75 to fix weedeaters. Yes, its worth fixing but only if you can figure it out on your own. You don't need any parts so you fixing it will be free. I can't tell you exactly how to recoil your spring since there are many different models but check your manual for the availability of a repair manual. First manually recoil the starter rope in the sprocket all the way. Reconnect the inside ring of the spring on the post and start coiling the spring by hand, both hands. You should reach a point where the spring force is making it tough to go further. At this point try to insert the outer ring of the spring inside the curve/post in the housing. This is just a general starting point. I've done many and had quite a few rexplode on my because I slipped. Give it a try, you have nothing to lose.
I'm unsure what caused it to fail to retract to begin with, but nothing appears to be broken. Maybe I'm overlooking some little something that caused the issue. Thanks for you help. I may give it a shot.
Jim_W