You need to find a guy at a table at a Finnish gunshow and ask him how to do it.

 

Thanks for the help. Very helpful.

 

I don't have one, but disassembly should be pretty strait forward.

Remove screw for follower. Add tension to spring and remove follower. Allow drum internals to rotate, counter clockwise, until all spring tension is released. That will be the most hazardous step as you will basically need to hold both the casing and the spiny bit and keep the spring tension under control while you unwind it, or it may just all go at once, and Clock Springs like to break if you just release them. The "Clock Spring" Will have some sort of a retainer, be it a slot, or something it is hooked over that it will need worked free from the central axis pin to remove it, but other wise the rotating bits should lift out.

Putting it back together would be the reversed, only thing is knowing how many rotations you need to retention the spring properly, but given the age of the spring you may need to give it an extra turn compared to spec just because of the deformation of the spring from being under tension for so long.

 

given the age of the spring you may need to give it an extra turn compared to spec just because of the deformation of the spring from being under tension for so long.

You didn't mean to reopen the debate spring retention did you?

 

This might sound silly but you should search online for "clock barrel mainspring". I suspect that the spring here functions and sits using the same technique - that will give you a good idea on how you can get this out - but as @pigood said there probably a hook or something in the center that sits in a slot on the main spring and the same goes for the outside of the spring

 

Like I said there had to be a retainer, requirement of a clock spring like that.

You can see it in the last picture, just below the central axis pin near the end of the coil. There is a pin or something pependicular to the central axis pin bout half way down the spring. But that is about as much as I can tell you, you will have to work out how it works.

Also, I didn't mention it before, but don't remove the clock spring from the spinny part of the houseing. Clock spings will uncoil when not entraped and, while not imposible, are a real pain in the ass to recoil enough to get them back in their holes.

Good luck!