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I've also hardly ever had to touch the tensioning bolt after lots of kms and touring trips.
Good point to mention, a lot of people buy one with a wrench, so the first thing they do is use the wrench.
I have quite a few Brooks saddles, but I have only used the wrench on two of mine. One was the 1960s vintage one that was overly softened before I bought the bike it was attached to, that saddle needed a lot of tightening, retired that saddle in the 1980s. And the honey color one that eventually became dark brown (photo in post 13 above) needed about half a revolution of tightening after the leather got a bit too damp after several days of rain. I used a rain cover, but some water still got through it on that trip.