Steve - While your Tessar is likely older, being from a plate camera, my Xenar 135, as best I recall, has a spec sheet image circle of 161 mm...barely adequate for , what is it 153-154 mm for a 4x5 filmholder openeing diagonal?
WClavey...I hesitantly suggest this...I was re-rusting a BB shutter w/RR lens from a 3A Model C, and after a couple recoveries in which I almost trashed the aperture diaphragm, I got it back together, cleaned the shutter with an aerosol solvent, and ended up with three as yet unknown, but visibly different shutter speeds.
Then, due to corrosion & fatigue I guess, the T/B catch spring broke. So I have 3 limiting speeds...I can't go slower or faster...this may be very limiting...What I am hesitatingly thinking about is what the likelihood is your Ball Bearing Shutter and mine have the same size leaves. I have a second one in uncorroded shape that has very different faceplates, etc. I think one says EKC and the other might say Kodak, so I don't know the age difference.
I haven't written off my shutter yet...I debated opening/removing the main spring so I can spin it open then put it on the SG. IF I went that way, I'd consider donating the shutter leaves. I am not confident of my own ability to transplant them. I can take things apart just fine...it's getting back together that is my weakness.
So, two concerns...the feasibility of compatibility, and your ability to get leaves back in order...I suppose that depends on a third factor...my documentation of the donor shutter leaf 'harvesting'.
The only thing delaying my writing off shutter function is whether I can Murray-rig an alternate spring method that would allow me to retain T&B, something I assume I may use more often than 1/25, 1/50, 1/100...but you're talking to someone who spends more time with equipment than film...maybe 3 speeds is enough.
1) Do you think your skills are adequate to accomplish a shutter leaf transplant?
2) If so, we could probably exchange images of the shutters to visually screen for different vintages.
3) This camera was donated to me, I have to solve the rotten bellows dilemma also, and the possibility of a coordinated component transplant seems cool.
I'm on the fence, but open enough to the possibility to have brought it up myself.
If you don't think you can do it, or there is a strong suggestion of different construction, I wouldn't want to sacrifice the blades/leaves.
Murray