At the risk of setting off another 150 post thread, why are you surprised at the results obtained using pre-WWII inexpensive technology? Until I mention the D word, you're playing with hardware designed in the 30's, in which the process is self-calibrated, less so the equipment. For most, LF remains a craft, rather than a technology, wherein the results are driven by the skill of the operator to understand and learn to use his tools, not the tools themselves. Exactly the same methodology you use in your workshop. As has been mentioned, repeatibility is the holy grail. The numbers on the dials really mean squat. Your job is to find the right combination of click time over the right sized hole that works in your process to give you the end result you want. LF is a craft of first principles, not technology (unless of course you have enough money to afford the D word .
As has been pointed out, even on new lens-shutters, the manufacturers generally quote +/- 25-30%, because they're still building 1930s shutters.
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