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@allsop
Possibly a dumb guy follow up, but here goes...
After getting more tension into the cable, surprise surprise, the FD now shifts nicely into the big ring. However, the issue now is that the chain rubs against the FD cage when I'm in the small(er) cogs. I've re-tensioned, adjusted the H limit and barrel adjuster, but no luck.
I've convinced myself the issue is that I have a braze on adapter which doesn't 'reach' out far enough to set the FD in the right starting position (meaning the derailleur will never shift far enough out because it only has so many degrees of lateral travel).
If that's the case, is it possible/sensible to 'shim' the adapter outwards by a couple of mm to set the derailleur in the right position? I even thought about a simple roll or two of electrical tape under the mount, but this seemed botch-y at best...
Obviously the thing works, but the rattle/grind of chain on cage is frustrating!