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We did a lots of expander replacement when there's a recall on the Tarmac SL7 not long ago, it's not a conventional expander that we're used to hence why it appear to be quite tricky.
Good call going to your LBS thought, when in doubt, best to go to them than try and attempt it further and risk voiding the lifetime warranty.

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Use a combination of compression-less and normal housing using housing connector.
Had some bike where distance from rim brake caliper to cable stop is so short that the compressionless housing doesn’t allow it to move, putting normal housing there but compressionless from lever to cable stop retain the sharp powerful braking.
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Today a funny day, don’t know why it took a while but I’ve realised that those in labour jobs tend to have smaller watches, but those in office jobs have gigantic watches.
After using a 34mm, I wanted a smaller digital one that’ll look smart, Casio tried and tested one is super comfortable, the bracelet is much more comfortable than the Tudor BB58 I used to have.
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Okay, so I’m gonna chim.
Both of you and @MCamb is right.
Sanding down rotor does do the trick, sure it may feel rough and horrid until it start to wear in, it can also contribute to the pads wearing out a tiny bit faster until it wear in with the rotor, performance might not be 100% as it once was, but does the trick.
It’s also doesn’t always work, sometime I’m lucky, other time it squeal and need further sanding.
In our workshop, it’s always better to just quote new pads and rotors if it’s contaminated because we can 100% offer our guarantee that it will work and completed in a timely manner.
On MTB, people aren’t that fussy as long the brake work better, we often sand down the rotor and put new pads but it really a case by case basis.
Mechanics are not cheap, they work on £60/hour (or complexity of jobs), it’s much cheaper at the time to go for a new pads and rotor, and never have to come back until the next service/fuck up.
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Got you, that sound like a tricky routing!
Can tell you it definitely can be done, just much harder in a home workshop.