Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
How's the shift quality?
I've worked with a couple of 105 triple front derailleurs that seemed to bind up and then, when it finally shifted, threw the chain across the granny ring. Worst of all the problem seemed to be intermittant. I attributed the problem to poor finish or some kind of burr on one of the die cast parts. I solved my problem by installing a chain watcher which, as you have said, won't work for you.
I'm wondering if a different front derailleur, even a different 105 front derailleur, might solve your problem.