Ok, hiked the 8x10, holders, lenses, miscellany, and two kids for a 2.5 round-trip walk to a local waterfall this morning, just to try out the splitter again. Negative's drying. Looks perfect, at least splitter-wise. Posts forthcoming.
Looks like the first test was either a bad holder (today's was a different one) or user error. I'm betting on the latter.
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