Bart_man
Clinging to gun&religion
I think I can fix most of it, it doesn't look that hard. it is just getting it aliened right will be the hard part it shouldnt be but a 15 minute and 2 beer job
Most Derailleur setups have multiple adjustment points in tensioning spring screws and in the cable length tension.
Get it installed as close as you can figure and make fine tuning ajustments after as he test rides it.
you're right..about two beers.