I hope so too, Tim. We've not heard from him since he first posted his questions. Perhaps he's out actually shooting.
FWIW, years ago, I set up my Sinar Norma at home to check out where on the lens to measure for the bellows extension; I did this for each of my lenses (3 Symmars and 3 Super Angulons) focused on infinity. Found that all the Symmars could be measured to the aperture control ring and all the SA's could be measured to the front of the lensboard. Then I made up a small chart of exposure factors calculated at incremental bellows extensions out to the bellows limit. It includes all six lenses. I keep that little chart in my field notebook (that is always with me); it saves having to do the calcs in the field, avoiding possible errors. I, too, use a very small metal re-coiling tape measure. So I only need to measure the extension, look up the factor, then shoot. It's a very fast system. We all make choices for our workflow, that's mine.
BTW, I'm curious whether I'm the only one who's noticed that OP stated his lens has no shutter. I tried to help him a bit in dealing with that.
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