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On the weekend, I knocked over most of the necessary work on my friend's Omega. The replacement rear wheel was properly dished and fitted with the garage stock chain and cassette and existing Marathon Plus. The rear derailleur was properly adjusted and the front derailleur was bodged. The chain has been rubbing on the cage in the middle ring and there is not much metal left, so it will need to be replaced soon. The rear brake pads were replaced from used garage stock but all the pads/ holders need to be replaced as the pad retention screws are corroded in place. A garage stock used front mudguard was fitted. The Brooks saddle tension nut a little tightened, which was much more trouble than you'd expect. Zip-tied the dynamo cable and adjusted both brakes’ worn pivots.
I still need to clean out the non-return valve on another friend's track pump after replacing the damaged chuck from garage stock.