Campag CT Front Derailleur snapped - problem

Unknown
edited December 1969 in Workshop
My Campag Compact front derailleur snapped yesterday (the vertical inner part of the cage snapped off where it bends at the top). My previous derailleur (installed by the bike shop who assembled the bike) buckled a couple of times before I decided to replace it (the cage kind of bent more open and I pinched it back into shape) The chain seems to 'catch' when shifting.

Anyone got any ideas as to what to analyze? It all seemed to be installed and working properly to me...

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Pedalling through Devon, trying to avoid the tourists...
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