my 2 year old 5d2 is facing an annoying issue right now - the top scroll dial (used to change ISO usually) sometimes doesn't engage the gears (there should be a clicking sound) when scrolled to the left. it always works when scrolled to right though.
called Canon and they are charging me US200 just to replace the dial alone. in view of the exorbitant charges, is there any chance that i could DIY and fix it myself? would need some instructions and sources for the components. at the same time, perhaps i could fix the "creaking body" issue as well.
let me know if anyone has the expertise on this matter! 

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