You're too soft.

I have the same problem, so I should know.

Say your hourly rate is $100.
You *must* charge him $100*1.5*time(diagnostic(from recieving call until back home))+$100*time(replacement).

There's just no other option.
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#00182, 10GB, Amber, Denmark, Peugeot 206, Rebuilding my stereo - great things to come