Hello again helpful LFs,
I'm sure only one or two recall my posts of a few months ago. I had to go through RT chemo, but I'm alive and back, albeit worse for wear and tear.

I'm going through my gear again and want to use my Schneider K 300mm tele, in it's Acme Synchro #3. Poor shutter needs some love.
I already did the swish and pray but the flash sync no work and the slow speeds are way off.
I want to open it up.

Here's the problem: apparently for non standard lenses, there are adapter rings that go between the lens barrel and the shutter. Mine has a bigger OD than the hole(s) in the black speed/fstop indicator plate. It bevels to the appropriate OD to allow it to fit.
I need to remove it. Tried unscrewing with increasing force. Ended up using lots of force and heat and penetrating oil. Nope.

Who knows how these adapters attach to the shutter?
I hope the attached pics help. Click image for larger version. 

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