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@Nick_S
In the absence of brazed-on bottle cage bosses, I thought I would try Zefal Gizmo mounts. These use unusual zip ties with a horizontal profile to the section which clasps the toothed area. They are then tightened further as the cage bolts are tightened. Unfortunately, it turns out that the zip ties' clasps are weak and they repeatedly failed as I tightened the bolts. In the end I ordered a couple of additional Gizmo kits to get the zip ties and then proceeded to tighten the new ones cautiously, with only one failure that again needed replacement. The bolts are plated rather than stainless steel, which seems a rather cheap move.
I think I'll write to Zefal as this is a flaw in the materials used for the zip ties. If it failed on a front fork, while holding a dry bag cage it could cause problems. In the photograph you can see four of the failed zip ties and a fresh one on the right.
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