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@Chris.
Mmm it was working ok for a while so shouldn't need shims or anything. CAAD10 frame.
Called up some bike shops but they're busy or closed today, so want to try and fix this myself and be a grown up and stuff.
So it's a CAAD10 frame, with Exogram chainset and SRAM Red YAW front mech, Force rear. Was working all fine before, but when I was in the big ring at the front and small cog at the back, I'd get some rubbing. Indexed the rear fine, and now the front is in pieces.
I've followed the steps in this video up until 2:55, but when I get to that point (it's been lined up and rotated, cable attached, limit screw turned so large cog doesn't rub etc), and it's set up on the smaller ring at the front, the shifter wont move the mech back up to the large chainring. It hardly moved at all when I push the lever in at the bars, but the weird thing is it feels like there's a decent amount of resistance - it's quite hard to push. Any ideas mechanical people? Thanks.
https://www.youtube.com/watch?v=cnG3t7TyRm0