Compound shutter main spring?

[Steven Tribe]

On it's way. This is not a commercial activity in any way (for Moderators)!
I doubt the shutter (mine) is worth the effort! The main spring has tension, but everything else seems totally locked. Dismantling screws are good.

[Tim Deming]

Update!
I received the donor shutter from Steven (many thanks!) and have successfully taken its main spring and installed it in my dead compound shutter. The spring removal and installation is straightforward. It installs as a cartridge unit, that is easily tensioned once installed, so no worries about breaking the spring or trying to adjust the tension. I’ve attached a few picts showing the spring mounting, and the final result. Sorry for the shaky picts, I was handholding in dim light.
Pic 1: This is Steven’s shutter, disassembled with the spring cartridge removed and sitting to the right. Quite a lot needs to be disassembled to get to this point, but it’s pretty obvious what needs to be removed to get to the spring mounting screws. The most important things are keeping track of the order of disassembly, remembering where everything goes (and noting that no screws are interchangeable), and having a good set of screwdrivers.
Pic 2: Back of my shutter, with old spring cartridge still in place, and replacement ready for installation. It’s worth noting that Steven’s shutter, although the same size compound from similar era, was slightly different from mine, and I had to file a few parts so the replaced spring + housing fit properly with the various linkages from my shutter.
Pic 3: my shutter, with most of the guts reassembled, remounted spring is at 3 o’clock
Pic 4: fully assembled, and back in camera! A bit of adjustment on the retardation spring (wire near the top right in Pic 3) allowed adjustment of shutter to get the speeds close to spot on.

cheers

Tim

[Steven Tribe]

Nice Alpin!
A very worthy new "home".

[Ron (Netherlands)]

Just found this 'old' but very informative thread because I was in search for members who had replaced a broken spring in a Compound or Compur shutter. Have a shutter comparable to that of Tim, albeit a little bigger. It seems to be a # 2 or 3 with a very nice Tessar. The shutter is complete but came with a broken spring which was still inside.
Might be a long shot but if anyone has such a shutter for parts I would be interested. Here some pictures of the shutter and its broken spring.

[Steven Tribe]

I'll have a look before the new year and get back to you.

[Ron (Netherlands)]

Many thanks Steven,
and happy holidays!

[Tim Deming]

I'll have alook as well once I'm home in a couple days. You might need a new cocking lever as well, since the levers mounted with 2 screws are much less common vs. those mounted with 3 screws, so finding a spring with a 2 screw mount could be difficult

Cheers

[Steven Tribe]

I didn't find anything of the right size, unfortunately!

[Ron (Netherlands)]

I didn't find anything of the right size, unfortunately!

Thanks anyway for searching!

[Ron (Netherlands)]

I'll have alook as well once I'm home in a couple days. You might need a new cocking lever as well, since the levers mounted with 2 screws are much less common vs. those mounted with 3 screws, so finding a spring with a 2 screw mount could be difficult

Cheers

Thanks Tim, indeed this one has the 'old' 2 screw lever - but in my box of spare parts I must have a 3 screw lever waiting to be used again....