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Good question: YesTERISK.
But it's when the cable is attached and tensioned that the problem seems to be occurring. I have got and old Huret braze-on that I know moves relatively loosely by hand. I might throw that into the mix and see if it works, then take it from there. Thanks!

@Scilly.Suffolk @Scrabble
Thanks both. It's really good to read these suggestions, as I've tried them already and thought I was going mad!
As a last test, I could only get enough cable tension by pulling the cable through the FD's cable bolt hard with pliers and tightening the bolt - then turning the barrel adjuster full out, to the point where the outer started to corkscrew.
Without this extreme tension, the STI doesn't seem to engage with shifting at all.

Could be I have two bits of equipment that are faulty. Or 'problem exists between chair and derailleur'.

Thanks again!

Having failed to set up two FDs (6600, 5700) on two different bikes, I am now eyeing the STI as maybe the problem. Does this ring true? In both cases, I was unable to get the FDs to shift from small chainring to large and so, today, have removed the FD entirely.

Here's how it was set up originally...
old steel Raleigh frame with braze-on:
Ultegra 6603 STI (triple)
FD-6600 (double)
FC-6600 (double)

I never got this to shift! I suspected the FD-6600 was just a bit knackered.
I replaced it with...

Ultegra 6603 STI (triple)
brand new FD-5700 (double)
FC-6600 (double)

Still couldn't get it to work properly, but I assumed this was my 11-thumbs approach to bike fixing.
Anyway, I put the bike in for a service, a frame crack was discovered and I had to replace the f + f. BUT, the person doing the service said that he thought my FD was broken because it wouldn't shift. Weird. NEW FD, never been set up. Broken?

I put all the gear on a replacement frame + fork...

carbon Ambrosius Celcius clamp/braze-on adaptor:
Ultegra 6603 STI
FD-5700
FC-6600

STILL couldn't get it to shift, so removed it entirely.
Any ideas how to test if it's the STI without breaking the bank and buying another?! Is the Triple a problem here? TIA!
Paul

Yikes. Well. If you don't sell...

MTB/flat bar Shimano shifter/brakes, couple of stems and bar ends £10 (could post)

...I'll take them!

tenner's worth of small Mtb + wheels pliz?

(hardly wanna ask the state of the headset for ten quid but...)

second dibs if nowt comes of user66626!

edit Frame. I have forks I think will fit.

Dibs FSA pista bars...

Well, my DMs are unanswered, but dibs if it's still available. I need a ready-to-go f+f for the commute as soon as possible! Ta, P.

Interested! DMing now...

oh crap. Just when I need a new commute frame and fork (current beater has a crack in the chain stay).
If you don't sell, I'd be interested in F+F, seatpost, bb, crankset, cassette.

lovely DA/Mavic wheel received with thanks! bump

Saddle collected - thanks very much for the hookup! bump

Dibs Velo Giant.
Shame that Laprade is 27.2...

Aye! Velo Giant looks ugly enough to deter future bolt-cutting. Thanks!

ASAP. Thanks...

reason: https://www.lfgss.com/comments/13436387/

Black Brooks B17 Narrow on 26.4 SR Laprade stem - stolen from Hanover Square today. Kryptonite cable looped through the rails was snipped and the seat bolt loosened.

This is how I get to work, so I'm looking for a -waitforit- saddle and 26.4 seatpost asap.

Interested for spares (I've now got a 105 in place). Message me? Thanks...

to replace a pranged FD-6600*, this morning.

I also snapped the chain > walk of shame back along CS7

TIA...

Dibs wheel? Will DM naaaaaaw

3rd unlikely dibs on raceblades!

PM'd for 5

Braze-on FD still available? (echo (echo (e c h o)))

Useful! Thanks... I've got a very reluctant FD-6600 where it sounds like a similar fouling problem and I can't get it to shift all the way to go from the small to the large ring. I'm going to experiment now.

My dad's well-used town bike has had a bit of a do (Selle Italia saddle I'd loaned him was nicked while locked up when the back wheel taco'd).
I just want to see if I can get it running again or if it's cheaper to get him another bike altogether.
I need a 700c wheel with a Shimano Nexus 3 internal hub/rollerbrake combo - no time for the hassle of lacing, truing... thanks!

Other than this, a ready-to-go beater M/L size that will fit 700 x 35c Marathon Plus tyres!