So we've found the change!
Cranks - you can tell if they're hollow inside as they have flat backs instead of an in-cut pattern. Anything XT is hollow, majority of LX are or used to be. Deore used to be a long time ago but not anymore. You may find it better to go for road cranks for alignment - I had to use quite a few spacers with the sprocket on my XT crank to get the chain-line matching up. Road hollowtech are 105 or Ultegra. I would look for a 105 with worn rings on eBay.
Also forgot, the handlebar is a right old slab of alloy. You can save 250g there at minimal cost with a replacement.
Last edited by snoopy20; 05-04-18 at 03:42 PM.