This problem has been fixed with the new version, making it the best on the market.
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With all due respect, Schaller have pushed their lackluster design (in my opinion and many others who've had Schallers fail on them) for decades before finally realizing that it could be better by adding an obviously much needed set screw to keep the mechanism on the strap without having to resort to loctite or some other type of thread glue. That already loses some points for me.
With that said, the new S-lock versions from Schaller looks pretty good, and pretty air tight from a design standpoint.
Meanwhile though, I've never once had the Dunlop design ones fail, and they've been essentially the same design (at least the locking mechanism) from the moment they started selling them. Additionally, they've always been held onto the strap by a snap ring (far better design from the get-go than the old schallers using only a washer and nut).
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