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unclamp the inner cable and let it out a bit.
It was unclamped.
Got impatient and bought a Tektro set which fits fine, so problem solved anyway I guess.
I failed to disclose my pads are under an angle in the driving direction, because I drilled the brake hole in the fork under an angle and have to compensate for that. I think that about pushed the pads in too close for this particular caliper.
Thanks for the replies.
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Oh noes! You admitted to less than perfect engineering in a response to the tester! #pray4tijs !
I'm using 105 (BR-5700) brakes on 25mm wide rims, and I've used 105 (BR-1050) on 23mm rims before. Any 105 generation in between should be fine with TB14s, as should anything later as Shimano are aware of the drift towards 23-25mm road rims (e.g. the 23.2mm wide WH-RS300-CL is identified as a match for current BR-R7000 brakes). From the look of it, the earlier (Golden Arrow) stuff should be fine too.
TL;DR: User error, unclamp the inner cable and let it out a bit.