Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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There are t basic types of ferrules, pressed or machined.
Pressed ferrules are made the same way as beer cans, have thin bottoms and zero structural strength. They're OK, (barely) for brake housing if the fittings are well made, but not at all suited for index housing. Their only virtue is that they're dirt cheap.
Machined ferrules come in many varieties but generally have thicker bottoms and greater structural strength. Brake ferrules usually have conical bottoms (inside) because it's easier to leave the shape of the drill point in place, but that can cause index housing wire to pinch closed binding the wire. Good quality index specific ferrules have flat or reverse conical bottoms so the housing doesn't get squeezed closed.
Whoever set up the OPs bike used whatever ferrule he grabbed first, ending up using the worst possible choice. A pressed ferrule, probably with a conical bottom.
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