Okay, first things first, I had internet connection problems last night and I could not get my post to show. I was stuck all day shooting a school board meeting... (theres six point five hours I will never get back) So here is the post I promised last night.
First, all must bow to the magnificience of the mighty Zeus(or so he believes)
Those are standard 12 inch tiles for a size reference.
Now onto the Zorkis. I am going to guess(never assume) that everybody knows how I got the Z6 to this point. You can see the tail of the spring poking out on the right side of the frame.
Here is the spring after removing the lever and the chrome ring above it. Notice how thin mine is in comparison to the one shown.
Now comes how I reassemble it. First, the advance lever has a claw that fits into the ratchet wheel. Mine is tensioned with a very small wire spring. My spring is bent and it takes a bit of work to get the claw in the proper postion and not loose the tensioning spring. I then work the catch of the advance spring in its proper location on the lever and then slide the lever into its proper postion. Thus using the lever to tension the advance spring. You can see the 'claw' I was referring to earlier in this shot. It is by the U-shaped cut out in advance lever.
Then I slide the chrome ring down and turn it to slide the catch of the spring up into the hole in the chrome ring. This takes a bit of pratice and a third hand sometimes. Usually, I use a small flat bladed screwdriver to help ease the spring up into postion. Then just screw the chrome ring back down.
Hopefully, this helps a bit with the issue you are having. I would suggest that you contact one of the known repair guys to see if they have the proper spring. Yours looks like somebody broke the spring and replaced it with whatever they had available at the time. If Yuri, Oleg or whoever doesn't have a proper spring, check with some of the reputable Ebay guys like Alex-photo or others.