I'm not a big fan of fighting your kids battles for them, but in this case, I think I would make an exception. I would ring her, myself and very politely but clearly explain just how much an hour she would have to pay for a mechanic to do this job. $100 is a pittence, your son gave up his free time for her for nothing!
If DS decides to do any 'mates rates' jobs in future, I'd be asking for cash up front prior to any work being done.


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